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    testo 645 - Humidity/temperature measuring instrument

    0560 6450
    testo 645
  1. High-precision humidity measurement up to ± 1% RH
  2. Internal reading memory (3,000 readings)
  3. Convenient data evaluation via optional PC software
  4. Possibility of attaching a really wide range of optional probes thanks to a large accessory portfolio
  5. The testo 645 humidity/temperature measuring instrument automatically indicates the measurement parameters of relative humidity, absolute humidity, dew point, degree of humidity, enthalpy and temperature at the touch of a button.
    The testo 645 high-precision humidity and temperature measuring instrument offers two probe inputs for attaching a comprehensive range of probes:
    • Channel 1: temperature probe, type K/J/S, NTC
    • Channel 2: humidity/temperature probe or Pt 100 temperature probe

    At the touch of a button, the thermohygrometer automatically indicates the measurement parameters of temperature, relative humidity, dew point, pressure dew point, absolute humidity, degree of humidity and enthalpy, along with min., max. and mean values, as well as the last measured value. Convenient evaluation of the measurement data is possible using the optional PC software. Measurement data can also be printed out directly at the measuring location via the optional testo fast printer.

    Areas of application of the testo 645 humidity/temperature measuring instrument

    • Monitoring of temperature and humidity values in production, storage and server rooms, museums, archives, cold stores, containers and display cases
    • Location of mould formation in residential or other buildings 

    testo 645 humidity/temperature measuring instrument, including battery.

    Temperature - Pt100

    Measuring range
    -200 to +800 °C
    Accuracy
    ±0.1 % of mv (200.1 to 800 °C)
    ±0.2 °C (-200 to 200 °C)
    Resolution
    0.1 °C

    Temperature - NTC

    Measuring range
    -50 to +150 °C
    Resolution
    0.1 °C

    Temperature - TC Type K (NiCr-Ni)

    Measuring range
    -200 to +1370 °C
    Accuracy
    ±0.5 % of mv (-200 to -60.1 °C)
    ±0.5 % of mv (+60.1 to +1370 °C)
    ±0.3 °C (-60 to +60 °C)
    Resolution
    0.1 °C

    Accessories: Humidity probes

  6. Accessories: Humidity probes
    Extension cable
    Extension cable
      :
      0409 0063
    • Accessories: Humidity probes
      Connection cable
      Connection cable
        :
        0430 0143
      • Accessories: Humidity probes
        saline solution pot
        testo saline solution pot for checking humidity probes, 33 %RH
          :
          0554 0636
        • Caps for humidity probes

          Humidity probes

        • Humidity probes
          No picture available
          Humidity/temperature probe
            :
            0636 9742
          • Probes

            Pt100 temperature probes

          • Pt100 temperature probes
            Standard immersion/penetration probe
              :
              0604 0273
            • Pt100 temperature probes
              Highly accurate immersion/penetration probe
              Highly accurate immersion/penetration probe
                :
                0628 0015
              • Pt100 temperature probes
                0628 0016
                Flexible precision immersion probe, cable heat-proof up to +265 °C
                  :
                  0628 0016
                • Type K (NiCr-Ni) probes

                  Additional accessories and Spare parts

                • Additional accessories and Spare parts
                  Extension cable
                  Extension cable
                    :
                    0409 0063
                  • Additional accessories and Spare parts
                    Connection cable
                    Connection cable
                      :
                      0430 0143
                    • Additional accessories and Spare parts
                      Sintered stainless steel filter
                        :
                        0554 0641
                      • Certificates

                        Printer and accessories

                      • Printer and accessories
                        Spare thermal paper
                        Spare thermal paper for printer, permanent
                          :
                          0554 0568
                        • Printer and accessories
                          testo-Schnelldrucker IRDA mit kabelloser Infrarot-Schnittstelle
                          testo fast printer IRDA
                            :
                            0554 0549
                          • Transport and Protection