testo 440 Humidity Kit with Bluetooth

$836.00 inc. GST

• Intuitive: Clearly structured measurement menus for long-term measurements and parallel determination of humidity and air temperature in storage, refrigerated, and in ventilation ducts

• Precise: calculation of dew point, wet bulb temperature and absolute humidity

• Convenient: Wireless probes, internal memory for data storage, and USB port for data export

•  Versatile: Your testo 440 setup can be expanded with a large selection of digital probes

The testo 440 kit is great for carrying out measurements in storage, refrigeration, and in ventilation ducts, and also on refrigeration systems and heat pumps. The testo 440 air velocity and IAQ measuring instrument and its humidity/temperature probe (Ø 0.47") with temperature sensor can all be safely stored in the included case.


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Use this practical kit to measure the humidity and temperature in storage, refrigerated and work rooms as well as in ventilation ducts. The testo 440 multifunction measuring instrument and the humidity/temperature probe are impressive thanks to their intelligent calibration concept, ease of use and maximum convenience for your measuring tasks.

testo 440 Humidity Kit with Bluetooth in detail

testo 440 air velocity and IAQ measuring instrument:

  • No task is too challenging, no application too specialized: the testo 440 combines a compact hand-held measuring instrument with intuitive measurement menus and a wide selection of air velocity and IAQ probes
  • Clearly structured measurement menu for long-term measurement: for long-term monitoring, enter the measurement time and measuring cycle in the measuring instrument and record measurement data trends. Other practical measurement menus, e.g. determining the cooling/heating output, mould detection, etc.
  • Easy storage and evaluation of measurement data. Measurement data memory for up to 7500 measurement protocols, which can be read via a USB port and further processed as a CSV file on the computer (e.g. with Excel)
  • Practical magnets for easy attachment of the measuring instrument to metal surfaces 
  • Automatic detection of probes, e.g. humidity/temperature probe
  • Large, backlit colour display 


Humidity/temperature probe with Bluetooth:


  • Use the humidity/temperature probe to accurately measure relative humidity and air temperature and to calculate dew point, wet bulb temperature, absolute humidity and heating/cooling output 
  • Reliable measurement results thanks to a high-quality, long-term stable humidity sensor. Measuring range: 0 to 100% RH / -20 to +70 °C, accuracy: ±2% RH / ±0.5 °C
  • Endlessly versatile: a universal handle can be connected to all probe heads – so you can take care of more applications using less equipment, and save space too
  • The Bluetooth handle makes it more convenient to carry out your measurement and guarantees less cable clutter in the case. It transmits the readings to the testo 440 air velocity and IAQ measuring instrument, from up to 20 m away
  • Practical button on the handle: for storing individual readings
  • Intelligent calibration concept: the testo 440 air velocity and IAQ measuring instrument remains in continuous use, since only the humidity/temperature probe head needs to be sent in for calibration

Scope of delivery

  • testo 440 air velocity and IAQ measuring instrument, 3 x AA batteries, USB cable and calibration protocol (0560 4401)
  • Humidity/temperature probe (Ø 12 mm) with Bluetooth* (consisting of humidity/temperature probe head and Bluetooth handle); 4 x AA batteries and calibration protocol (0636 9731)
  • Basic case for testo 440 and 1 probe 
  • *Please do not use the probe in condensing atmospheres. For continuous application in high-humidity ranges
    •     > 80% RH at ≤ 30 °C for > 12 h
    •     > 60% RH at > 30 °C for > 12 h


Temperature - NTC

Measuring range -40 to +150 °C
Accuracy ±0.4 °C (-40 to -25.1 °C)
±0.3 °C (-25 to 74.9 °C)
±0.4 °C (75 to 99.9 °C)
±0.5 % of mv (Remaining Range)
Resolution 0.1 °C

Temperature - TC Type K (NiCr-Ni)

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

General technical data

Dimensions 154 x 65 x 32 mm
Operating temperature -20 to +50 °C
Connectable probes 1 x digital probe with cable or 1 x Temperature NTC TUC, 1 x digital Bluetooth probe or testo Smart Probe, 1 x Temperature TC Type K
Battery type 3 AA 
Battery life 12 h (typically vane measurement)
Data transfer Bluetooth®; USB interface
Storage temperature -20 to +50 °C
Weight 250 g

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