1. Home
    2. testo 420

    testo 420 - Differential pressure measuring instrument

    0560 0420
    £ 799.00 £ 958.80
    1
  1. Differential pressure measurement, e.g. to check filters in air conditioning and ventilation systems
  2. Calculate flow velocity and volume flow using a Pitot tube
  3. Handy instrument featuring a large display and user-friendly menu guidance
  4. Save measurement data for analysis and documentation
  5. Use the testo 420 differential pressure measuring instrument to carry out simple, efficient tests on filters. You can also use the measuring instrument in conjunction with a Pitot tube to measure flow velocity and volume flow really easily in ventilation ducts.
    • not available

      testo Smart App

      The App for all applications. Multifunctional. Continuously up to date. Free.

      Find out more

    • not available

      Air balancing – time saving up to 30%

      New PRO measuring program in the testo Smart App

      Find out more

    The testo 420 differential pressure measuring instrument is suitable for accurate differential pressure measurement up to 120 Pa, e.g. when checking filters in HVAC systems. Flow velocity and volume flow are calculated by the testo 420. The measuring instrument can also be used for absolute pressure measurement.

    Differential pressure measuring instrument with practical functions

    You can use a Pitot tube and compatible connection hoses (both optional) to measure the flow velocity and volume flow in ventilation ducts. Timed and multi-point mean calculation, as well as the combination of the two, along with simple input of the duct geometry provide you with support for measurements in ducts.

    The automatic zeroing ensures higher accuracy for low pressures. All measuring values are easy to read on the large display which has an illumination function.

    Documenting the measurement data

    Measurement data can be stored in the differential pressure measuring instrument for analyses and documentation. It's easy to manage the measurement data on the PC without any additional software, via the plug & play function.

    testo 420 differential pressure measuring instrument including batteries and calibration protocol.

    Customers who viewed this product also viewed

  6. Customers who viewed this product also viewed
    testo 510 - Differential Pressure Meter
    • Pocket-sized temperature-compensated differential pressure measurement
    • Illuminated display
    :
    0563 0510
    1
  7. Customers who viewed this product also viewed
    testo 420
    testo 420 - Differential pressure measuring instrument
    • Differential pressure measurement, e.g. to check filters in air conditioning and ventilation systems
    • Calculate flow velocity and volume flow using a Pitot tube
    :
    0560 0420
    1
  8. Customers who viewed this product also viewed
    testo 440 dP Air velocity and IAQ measuring instrument including differential pressure sensor
    testo 440 dP - Air velocity and IAQ measuring instrument including differential pressure sensor
     
    • A measuring instrument for all climate-related parameters
    • Includes a differential pressure sensor: for Pitot tube measurement and monitoring filters
    :
    0560 4402
    1
  9. Customers who viewed this product also viewed
    testo 440 Delta P Air Flow ComboKit 2 with Bluetooth®
    testo 440 delta P Air Flow ComboKit 2 with Bluetooth®
    • A measuring instrument for all climate-related parameters
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts, at ventilation outlets and in work rooms
    :
    0563 4410
    1
  10. Customers who viewed this product also viewed
    testo 440 Delta P Air Flow ComboKit 1 with Bluetooth®
    testo 440 delta P Air Flow ComboKit 1 with Bluetooth®
    • A measuring instrument for all climate-related parameters
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts or at ventilation outlets
    :
    0563 4409
    1
  11. Customers who viewed this product also viewed
    testo 400 Universal IAQ instrument
    testo 400 - Universal IAQ instrument
    • A measuring instrument for all climate-related parameters
    • 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
    :
    0560 0400
    1
  12. Customers who viewed this product also viewed
    testo 400 air flow kit with hot wire probe
    testo 400 air flow kit with hot wire probe
    • A measuring instrument for all climate-related parameters
    • Standard-compliant determination of the volume flow in ducts using grid measurements as per EN ISO 12599 and ASHRAE 111
    :
    0563 0400 71
    1
  13. Customers who viewed this product also viewed
    testo 400 air flow kit with 16 mm vane probe
    testo 400 air flow kit with 16 mm vane probe
    • A measuring instrument for all climate-related parameters
    • Standard-compliant determination of the volume flow in ducts using grid measurements as per EN ISO 12599 and ASHRAE 111
    :
    0563 0400 72
    1
  14. Customers who viewed this product also viewed
    testo 512-1
    testo 512-1 - Digital differential pressure measuring instrument with App connection
    • Simple, fast and precise differential pressure measurement (0 to 200 hPa) for checking filters and for Pitot tube measurement in the ventilation duct
    • Reliable measurement results due to position-independent differential pressure sensor with high accuracy
    :
    0563 1512
    1
  15. Differential Pressure - Piezoresistive

    Measuring range
    +0.1 to +14 m/s
    -120 to +120 Pa
    Accuracy
    ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
    Resolution
    0.01 m/s
    0.001 Pa
    Reaction time
    1 s (t₉₀)

    Absolute Pressure

    Measuring range
    700 to 1100 hPa
    Accuracy
    ±3 hPa
    Resolution
    0.1 hPa
    Reaction time
    1 s

    General technical data

    Dimensions
    150 x 85 x 35 mm
    Operating temperature
    -5 to +50 °C
    EU-/EG-guidelines
    EU-guideline 2014/30/EU
    Battery type
    Alkali manganese, mignon, type AA
    Battery life
    40 h
    Display size
    3.5"
    Display function
    Dot matrix
    Display ligthing
    with illumination
    Interface
    Micro-USB
    Memory
    2 GB (internal)
    Storage temperature
    -20 to +60 °C

    Additional accessories and Spare parts

  16. Additional accessories and Spare parts
    Connection hose
    Connection hose silicone-free for differential pressure measurement, length 5 m, load up to maximum 700 hPa, (mbar)
      :
      0554 0453
      £ 47.00 £ 56.40
      1
    • Additional accessories and Spare parts
      Staurohr
      Stainless steel Pitot tube, length 1000 mm, Ø 7 mm - for measuring flow velocity
        :
        0635 2345
        £ 425.00 £ 510.00
        1
      • Additional accessories and Spare parts
        Staurohr
        Stainless steel Pitot tube, length 350 mm, Ø 7 mm - for measuring flow velocity
          :
          0635 2145
          £ 145.00 £ 174.00
          1
        • Additional accessories and Spare parts
          Staurohr
          Stainless steel Pitot tube, length 500 mm, Ø 7 mm - for measuring flow velocity
            :
            0635 2045
            £ 155.00 £ 186.00
            1
          • Additional accessories and Spare parts
            Connection hose, silicone
            Connection hose, silicone - max. load capacity up to 700 hPa (mbar)
              :
              0554 0440
              £ 42.00 £ 50.40
              1