1. Home
    2. testo 400

    testo 400 - Universal IAQ instrument

    0560 0400
  1. Smart, intuitive measurement programs including HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD and turbulence as per EN ISO 7730 and ASHRAE 55
  2. High-precision, location-independent and integrated differential pressure sensor
  3. Measure all IAQ-related parameters – with our wide range of probes for all IAQ measurements
  4. Document measuring values directly on the customer's site and send them by e-mail, or further analyze them using the testo DataControl PC software
    5. The testo 400 is the universal measuring instrument for all IAQ professionals. Measure, analyze and document all IAQ and comfort level parameters using just one instrument – simply, conveniently and in compliance with the standards. High-quality measuring technology, intuitive measurement assistants, versatile documentation options and a comprehensive selection of IAQ probes make the testo 400 the perfect partner for your day-to-day work.
    • not available

      Product registration

      When you register your product, we will extend the regular manufacturer's warranty by one year.

      Register now

    As an expert in the field of air conditioning and ventilation, you will find the testo 400 universal IAQ measuring instrument ideal. The IAQ measuring instrument with a built-in measurement assistant provides optimum support for carrying out air flow and comfort level measurements in accordance with the standards, as well as for adjusting and inspecting air conditioning and ventilation systems.

     

    testo 400 universal IAQ instrument – features

    Impressive IAQ measurement technology
    • High-precision, location-independent, built-in differential pressure sensor
    • Integrated absolute pressure sensor
    • Measures all IAQ-related parameters: Flow velocity, temperature, humidity, pressure, illuminance, radiant heat, turbulence, CO2 and CO
    • Numerous connection options for probes: 2 x cable probes (TUC), 4 x Bluetooth® probes, 2 x type K thermocouple probes
    • Compatible with a wide range of available Bluetooth® and cable probes – so you’ll be equipped for any measuring task
    • Compatible with the testo 420 volume flow hood: Simply connect to the testo 400 via Bluetooth, measure volume flow at larger air inlets and outlets and manage all customer and measuring site data on site using one measuring instrument
    • For high-precision measurements and less downtime: Adjustment function at up to six measuring points for zero-error display, probe heads can be replaced without restarting the IAQ measuring instrument, high-quality probes with an intelligent calibration concept (probe calibration independent of the measuring instrument)
    • Long-term monitoring of the indoor air quality: Order the IAQ data logger for carrying out long-term measurements with the testo 400 IAQ measuring instrument. While the stand-alone data logger is carrying out the IAQ measurement, you can use the IAQ measuring instrument for measurements elsewhere

    Smart, intuitive, practical: Measurement programs, measurement data management and operation
    • For error-free measurements in accordance with the standards: Smart, intuitive measurement menus and evaluation of readings provide optimum support for your measuring task. Use the measurement programs for standard-compliant measurements: HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD as per EN ISO 7730 and ASHRAE 55, draught and turbulence as per EN ISO 7730 and ASHRAE 55, WBGT measurement as per DIN 33403 and EN ISO 7243, NET measurement as per DIN 33403
    • Complete the measurement along with full documentation including photos, comments and your own logo at the customer’s premises, and send by e-mail (via WLAN)
    • Customer and measuring point management is carried out on the measuring instrument itself – for efficient work on site.
    • Smart-touch display for intuitive operation of the IAQ measuring instrument
    • testo DataControl PC software for further analysis, archiving and documentation of measurement data on your computer
    • Built-in WLAN and Bluetooth® interfaces: Send measurement reports directly on site or print them out with a suitable printer

    1 x testo 400 universal IAQ instrument, including transport case for air flow measurements, connection hose, mains unit with USB cable, calibration protocol and instruction manual.

    Temperature - NTC

    Measuring range
    -40 to +150 °C
    Accuracy
    ±0.5 % of mv ±1 Digit (Remaining Range)
    ±0.4 °C ±1 Digit (+75 to +99.9 °C)
    ±0.2 °C ±1 Digit (-25 to +74.9 °C)
    ±0.4 °C ±1 Digit (-40 to -25.1 °C)
    Resolution
    0.1 °C

    Temperature - TC Type K (NiCr-Ni)

    Measuring range
    -200 to +1370 °C
    Accuracy
    ±(0.3 °C + 0.1 % of mv) ±1 Digit
    Resolution
    0.1 °C

    Differential pressure (internal sensor) - Piezoresistive

    Measuring range
    0 to +200 hPa
    Accuracy
    ±(0.1 hPa + 1.5 % of mv) ±1 Digit (25.001 to 200 hPa)
    ±(0.3 Pa + 1 % of mv) ±1 Digit (0 to 25 hPa)
    Resolution
    0.001 hPa

    Comfort probes

  5. Comfort probes
    Turbulence probe (digital), wired
    Turbulence probe (digital), wired: for determining the degree of turbulence and draught risk according to EN ISO 7730 / ASHRAE 55 – measuring range 0 to +5 m/s, 0 to +50 °C
      :
      0628 0152
    • Comfort probes
      CO2 probe (digital) with Bluetooth® including temperature and humidity sensor
      CO₂ probe (digital) with Bluetooth® including temperature and humidity sensor: for measuring the indoor air quality in offices, production areas or storage facilities – measuring range 0 to 10,000 ppm, -10 to +50 °C, 5 to 95% RH
        :
        0632 1551
      • Comfort probes
        Lux probe (digital) for measuring illuminance, wired
        Lux probe (digital), wired: for measuring illuminance in workplaces (e.g. offices, production areas) – measuring range 0 to 100,000 lux
          :
          0635 0551
        • Comfort probes
          CO2 probe (digital) including temperature and humidity sensor, wired
          CO₂ probe (digital) including temperature and humidity sensor, wired: for measuring the indoor air quality in offices, production areas or storage facilities – measuring range 0 to 10,000 ppm, -10 to +50 °C, 5 to 95% RH
            :
            0632 1552
          • Comfort probes
            CO probe (digital) with Bluetooth®
            CO probe (digital) with Bluetooth®: for measuring carbon monoxide in indoor areas (e.g. boiler rooms) – measuring range 0 to 500 ppm
              :
              0632 1271
            • Comfort probes
              CO probe (digital), wired
              CO probe (digital), wired: for measuring carbon monoxide in indoor areas (e.g. boiler rooms) – measuring range 0 to 500 ppm
                :
                0632 1272
              • Comfort probes
                Globe probe Ø 150mm
                Globe thermometer (TC type K) for the measurement of radiant heat – measuring range 0 to + 120 °C
                  :
                  0602 0743
                • Comfort probes
                  WBGT kit testo 400
                  WBGT kit for universal IAQ measuring instrument testo 400
                    :
                    0618 7220

                    • Humidity probes

                  • Humidity probes
                    High-precision humidity/temperature probe (digital) with Bluetooth®
                    High-precision humidity/temperature probe (digital) with Bluetooth®: for measurements in cleanrooms and laboratories, and critical processes in the pharmaceutical, industrial and food sectors, as well as in storage, refrigerated and work rooms or in air conditioning/ventilation ducts - accuracy: ±(0.6% RH + 0.7 % of m.v.) (0 to 90% RH) / ±0.3 °C (+15 to +30 °C)
                      :
                      0636 9771
                    • Humidity probes
                      High-precision humidity/temperature probe (digital), wired
                      High-precision humidity/temperature probe (digital), wired: for measurements in cleanrooms and laboratories, and critical processes in the pharmaceutical, industrial and food sectors, as well as in storage, refrigerated and work rooms or in air conditioning/ventilation ducts - accuracy: ±(0.6% RH + 0.7 % of m.v.) (0 to 90% RH) / ±0.3 °C (+15 to +30 °C)
                       
                        :
                        0636 9772
                      • Humidity probes
                        Robust humidity/temperature probe (digital) - for temperatures up to +180 °C, wired
                        Robust humidity/temperature probe (digital) for temperatures up to +180 °C, wired: for measurements in industrial exhaust air, in bulk materials and in climatic test cabinets – accuracy ±2% RH (2.1 to 98% RH) / ±0.4 °C (0.1 to +50 °C), measuring range 0 to 100% RH / -20 to +180 °C
                         
                          :
                          0636 9775
                        • Humidity probes
                          testo 605i - thermohygrometer operated via smartphone
                            :
                            0560 2605 02

                            • Pitot tubes

                          • Pitot tubes
                            Staurohr
                            Stainless steel Pitot tube, length 500 mm, Ø 7 mm - for measuring flow velocity
                              :
                              0635 2045
                            • Pitot tubes
                              Staurohr
                              Stainless steel Pitot tube, length 350 mm, Ø 7 mm - for measuring flow velocity
                                :
                                0635 2145
                              • Pitot tubes
                                Staurohr
                                Stainless steel Pitot tube, length 1000 mm, Ø 7 mm - for measuring flow velocity
                                  :
                                  0635 2345

                                  • Pressure probes

                                • Pressure probes
                                  testo 510i – differential pressure measuring instrument with smartphone operation
                                    :
                                    0560 1510
                                  • Pressure probes
                                    testo 549i - High-pressure gauge operated via smartphone
                                      :
                                      0560 2549 02

                                      • Temperature probes

                                    • Temperature probes
                                      testo 805i – infrared thermometer with smartphone operation
                                        :
                                        0560 1805
                                      • Temperature probes
                                        High-precision immersion/penetration probe (digital)
                                        High-precision immersion/penetration probe (Pt100 temperature sensor, digital) for temperature measurements in liquids and pastes – measuring range -80 to +300 °C, accuracy up to ±0.05 °C
                                          :
                                          0618 0275
                                        • Temperature probes
                                          Immersion/penetration probe (digital)
                                          Immersion/penetration probe (digital) with Pt100 temperature sensor: for temperature measurements in liquids and pastes – measuring range -100 to +400 °C, accuracy up to ±0.15 °C
                                            :
                                            0618 0073
                                          • Temperature probes
                                            Robust, fast-action air probe (digital)
                                            Robust, fast-action air probe (digital)
                                              :
                                              0618 0072
                                            • Temperature probes
                                              Flexible temperature probe (digital)
                                              Flexible temperature probe (digital) with Pt100 temperature sensor: for temperature measurements in locations that are difficult to access and in liquids – measuring range -100 to +260 °C
                                                :
                                                0618 0071
                                              • Temperature probes
                                                Temperature probe with Velcro and NTC temperature sensor
                                                Temperature probe with Velcro (NTC temperature sensor) for measuring the surface temperature of pipes – measuring range -50 to +70 °C
                                                  :
                                                  0615 4611
                                                • Temperature probes
                                                  Robuster Luftfühler, TE Typ K
                                                  Robust air temperature probe (TC type K) – measuring range: -60 to +400 °C
                                                    :
                                                    0602 1793
                                                  • Temperature probes
                                                    Fast-action surface probe with sprung thermocouple strip
                                                    Fast-action surface probe (TC type K) – measuring range -60 to +300 °C, short-term up to +500 °C
                                                      :
                                                      0602 0393
                                                    • Temperature probes
                                                      Fast-reaction paddle surface probe
                                                      Fast-reaction paddle surface probe (TC type K) - Measuring range: - 0 to +300°C
                                                        :
                                                        0602 0193
                                                      • Temperature probes
                                                        Efficient, waterproof surface probe with small measurement head
                                                        Waterproof surface temperature probe with a small measuring head (TC type K) – measuring range: -60 °C to +1000 °C
                                                          :
                                                          0602 0693
                                                        • Temperature probes
                                                          Fast-action surface probe with sprung thermocouple strip
                                                          Fast-action, angled surface temperature probe (TC type K) for flat and uneven surfaces – measuring range: -60 to +300 °C
                                                            :
                                                            0602 0993
                                                          • Temperature probes
                                                            Magnetic probe (TC type K) - for surface temperatures
                                                            Surface temperature probe with magnet (TC type K), adhesive power 20 N – Measuring range -50 to +170°C
                                                              :
                                                              0602 4792
                                                            • Temperature probes
                                                              Magnetfühler, Haftkraft ca. 10 N, mit Haft-Magneten
                                                              Surface temperature probe with magnet (TC type K), adhesive power 10 N – Measuring range -50 to +400°C
                                                                :
                                                                0602 4892
                                                              • Temperature probes
                                                                Waterproof surface probe with widened measurement tip
                                                                Waterproof surface temperature probe with widened measuring tip (TC type K) for flat surfaces – measuring range -60 to +400 °C
                                                                  :
                                                                  0602 1993
                                                                • Temperature probes
                                                                  Pipe wrap probe with velcro strip
                                                                  Temperature probe with Velcro (TC Type K)
                                                                    :
                                                                    0628 0020
                                                                  • Temperature probes
                                                                    Pipe wrap probe for pipe diameter 5 to 65 mm
                                                                    Temperature probe (TC type K) with clamping bracket for measurements on pipes with Ø 5-65 mm – Measuring range -60 to +130°C, briefly up to +280°C
                                                                      :
                                                                      0602 4592
                                                                    • Temperature probes
                                                                      Clamp probe for measurements on pipes
                                                                      Clamp probe (TC type K) for temperature measurements on pipes with Ø 15-25 mm – Measuring range -50 to +100°C, briefly up to +130°C
                                                                        :
                                                                        0602 4692
                                                                      • Temperature probes
                                                                        Efficient and fast-action immersion probe, waterproof
                                                                        Flexible, fast-action immersion probe (TC type K) – measuring range: -60 to +1000 °C
                                                                          :
                                                                          0602 0593
                                                                        • Temperature probes
                                                                          Fast-action, waterproof immersion/penetration probe
                                                                          Fast-action immersion/penetration probe (TC type K) – measuring range: -60 to +800 °C
                                                                            :
                                                                            0602 2693
                                                                          • Temperature probes
                                                                            Tauch-Messspitze, biegsam, TE Typ K
                                                                            Immersion measuring tip with TC plug type K - for fast temperature measurements
                                                                              :
                                                                              0602 5792
                                                                            • Temperature probes
                                                                              Immersion measurement tip, flexible, for measurements in air
                                                                              Flexible immersion measuring tip (TC type K) - Measuring range: -40 to +1000°C
                                                                                :
                                                                                0602 5693
                                                                              • Temperature probes
                                                                                Waterproof immersion/penetration probe, TC Type K
                                                                                Waterproof immersion/penetration probe (TC type K) – measuring range -60 to +400 °C
                                                                                  :
                                                                                  0602 1293
                                                                                • Temperature probes
                                                                                  Flexible, low-mass immersion measurement tip
                                                                                  Exceptionally fast temperature probe (TC Type K)
                                                                                    :
                                                                                    0602 0493
                                                                                  • Temperature probes
                                                                                    Wasserdichter Lebensmittelfühler aus Edelstahl (IP65)
                                                                                    Waterproof stainless steel food probe (TC type K) - measuring range: -60 to +400°C
                                                                                      :
                                                                                      0602 2292
                                                                                    • Temperature probes
                                                                                      Thermocouple with TC adapter, flexible, 800 mm long
                                                                                      Flexible thermoelectric couple (TC type K, glass fibre) – Measuring range: -50 to +400°C
                                                                                        :
                                                                                        0602 0644
                                                                                      • Temperature probes
                                                                                        Thermocouple with TC adapter, flexible, length 1500 mm
                                                                                        Flexible thermoelectric couple (TC type K, glass fibre) – measuring range -50 to +400°C
                                                                                          :
                                                                                          0602 0645
                                                                                        • Temperature probes
                                                                                          Thermocouple with TC adapter, flexible, 1500 mm long, PTFE
                                                                                          Flexible thermoelectric couple (TC type K, PTFE) – measuring range -50 to +250°C
                                                                                            :
                                                                                            0602 0646
                                                                                          • Temperature probes
                                                                                            testo 115i - Clamp thermometer operated via smartphone
                                                                                              :
                                                                                              0560 2115 02
                                                                                            • Temperature probes
                                                                                              testo 915i
                                                                                              testo 915i - Thermometer with air probe (TC type K) and smartphone operation
                                                                                                :
                                                                                                0563 3915

                                                                                                • Velocity

                                                                                              • Velocity
                                                                                                Hot wire probe (digital) with Bluetooth® including temperature and humidity sensor
                                                                                                Hot wire probe (digital) with Bluetooth® including temperature and humidity sensor: for measurements in ventilation ducts – measuring range 0 to +50 m/s, -20 to +70 °C, 5 to 95% RH
                                                                                                  :
                                                                                                  0635 1571
                                                                                                • Velocity
                                                                                                  Hot wire probe (digital) including temperature and humidity sensor, wired
                                                                                                  Hot wire probe (digital) including temperature and humidity sensor, wired: for measurements in ventilation ducts – measuring range 0 to +50 m/s, -20 to +70 °C, 5 to 95% RH
                                                                                                    :
                                                                                                    0635 1572
                                                                                                  • Velocity
                                                                                                    Vane probe (Ø 16 mm, digital) with Bluetooth®, including temperature sensor
                                                                                                    Vane probe (Ø 16 mm, digital) with Bluetooth® including temperature sensor: for measurements in ventilation ducts – measuring range +0.6 to +50 m/s, -10 to +70 °C
                                                                                                      :
                                                                                                      0635 9571
                                                                                                    • Velocity
                                                                                                      Vane probe (Ø 16 mm, digital) including temperature sensor, wired
                                                                                                      Vane probe (Ø 16 mm, digital) including temperature sensor, wired: for measurements in ventilation ducts – measuring range +0.6 to +50 m/s, -10 to +70 °C
                                                                                                        :
                                                                                                        0635 9572
                                                                                                      • Velocity
                                                                                                        Hot wire probe (digital) including temperature sensor, wired
                                                                                                        Hot wire probe (digital) including temperature sensor, wired: for measurements in ventilation ducts – measuring range 0 to 30 m/s, -20 to +70 °C
                                                                                                          :
                                                                                                          0635 1032
                                                                                                        • Velocity
                                                                                                          Fume cupboard probe (digital), wired
                                                                                                          Fume cupboard probe (digital), wired: for measuring inflow speed and exhaust air volume flow in fume cupboards according to DIN EN 14175-3/-4 – measuring range 0 to 5 m/s, 0 to +50 °C
                                                                                                            :
                                                                                                            0635 1052
                                                                                                          • Velocity
                                                                                                            High-precision vane probe (Ø 100 mm, digital) including temperature sensor, wired
                                                                                                            High-precision vane probe (Ø 100 mm, digital) including temperature sensor, wired: for measurements at air outlets in cleanrooms, as well as at plate outlets, ventilation grilles or swirl outlets – measuring range +0.1 to +15 m/s, -20 to +70 °C
                                                                                                              :
                                                                                                              0635 9372
                                                                                                            • Velocity
                                                                                                              Vane probe (Ø 100 mm, digital) with Bluetooth® including temperature sensor
                                                                                                              Vane probe (Ø 100 mm, digital) with Bluetooth® including temperature sensor: for measurements at ceiling/air outlets and at plate outlets, ventilation grilles or swirl outlets – measuring range +0.3 to +35 m/s, -20 to +70 °C
                                                                                                                :
                                                                                                                0635 9431
                                                                                                              • Velocity
                                                                                                                Vane probe (Ø 100 mm, digital) including temperature sensor, wired
                                                                                                                Vane probe (Ø 100 mm, digital) including temperature sensor, wired: for measurements at ceiling/air outlets and at plate outlets, ventilation grilles or swirl outlets – measuring range +0.3 to +35 m/s, -20 to +70 °C
                                                                                                                  :
                                                                                                                  0635 9432
                                                                                                                • Velocity
                                                                                                                  testo 405i – thermal anemometer with smartphone operation
                                                                                                                    :
                                                                                                                    0560 1405
                                                                                                                  • Velocity
                                                                                                                    testo 410i – vane anemometer with smartphone operation
                                                                                                                      :
                                                                                                                      0560 1410
                                                                                                                    • Velocity
                                                                                                                      Hot ball probe (Ø 3 mm) - for flow and temperature
                                                                                                                      Hot ball probe (Ø 3 mm, digital), incl. temperature sensor, fixed cable: for measurement in non-directional air flows – measuring range 0 to 10 m/s, -20 to +70 °C
                                                                                                                        :
                                                                                                                        0635 1051
                                                                                                                      • Velocity
                                                                                                                        Hot wire probe
                                                                                                                        Hot wire probe (Ø 7.5 mm, digital), incl. temperature sensor, fixed cable: for measurement in ventilation ducts, at plate outlets, ventilation grilles – measuring range 0 to 20 m/s, -20 to +70 °C
                                                                                                                          :
                                                                                                                          0635 1026
                                                                                                                        • Velocity
                                                                                                                          testo 420
                                                                                                                          Make sure you get the testo 420 volume flow hood for larger ceiling outlets and at the same time enjoy multiple maintenance benefits on HVAC systems. Because the flow hood with the removable measuring instrument is not only exceptionally light, it also guarantees accurate volume flow calculations at swirl outlets
                                                                                                                            :
                                                                                                                            0563 4200

                                                                                                                            • IAQ measurements in the field of air conditioning and ventilation

                                                                                                                            • High-precision, location-independent and built-in differential pressure sensor, smart and intuitive measurement programs for IAQ measurements in accordance with the standards, creation of documentation on site, e-mailing of reports, versatile combination options with IAQ probes
                                                                                                                            application testo 400 Universal IAQ instrument

                                                                                                                            IAQ measurements in the field of air conditioning and ventilation

                                                                                                                            Custom-combine your Testo IAQ measuring instrument with IAQ probes and accessories for your application.
                                                                                                                             
                                                                                                                            With the right products, you can handle all kinds of IAQ applications:
                                                                                                                             
                                                                                                                            • Air flow measurements: Flow measurements in ducts, at outlets and on filters as per EN ISO 12599 and ASHRAE 111
                                                                                                                            • Comfort level measurements: Measurement of indoor air quality or turbulence as per EN ISO 7730 and ASHRAE 55, NET measurement as per DIN 33403, PMV/PPD as per EN ISO 7730 and ASHRAE 55, WBGT measurement as per DIN 33403 and EN ISO 7243
                                                                                                                            • Measurements in laboratories and cleanrooms: Flow measurements in fume cupboards as per DIN EN 14175-3/-4, differential pressure measurements and laminar flow measurements in cleanrooms, humidity measurements in cleanrooms
                                                                                                                            application testo 400 Universal IAQ instrument