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Smart Thermohygrometer - Testo 605i


In addition to measuring air temperature and relative humidity in rooms and ducts, the thermohygrometer is also suitable for checking air conditioning system humidifiers. When you use the testo 605i in conjunction with the testo 805i infrared thermometer, you can clearly identify areas susceptible to mould via the traffic light principle, with the assistance of a measurement menu that is already stored in the App.Measure more efficiently using the App 
The testo 605i wirelessly transmits the measurement data via Bluetooth to your own smartphone or tablet. With the testo Smart Probes App installed on your terminal device, you can view your readings conveniently. The App also enables the dew point and wet-bulb temperature to be determined automatically. All measurement data is displayed either as a chart or in table form. The measurement data log can then be emailed directly as a PDF or Excel file. 
System requirements:
  iOS 8.3 or later 
  Android 4.3 or later 
  Bluetooth 4.0

Product Benefits:

  • Compact professional measuring instrument from the Testo Smart Probes series, for use with smartphones / tablets.

  • Measurement of air humidity and temperature in rooms and ducts.

  • Automatic calculation of dew-point and wet bulb temperature via Testo Smart Probes App

  • Measurement data analyzed and sent via Testo Smart Probes App

  •  Space-saving and easy to transport

  • Made in Germany

  • Two Years Warranty

Delivery Scope:

 Testo 605i thermohygrometer with smartphone operation, including batteries and calibration protocol.


Technical Details:

Temperature - NTC

Measuring range

-20 to +60 °C


±0.8 °C (-20 to 0 °C)

±0.5 °C (0 to +60 °C)


0.1 °C


Humidity - Capacitive

Measuring range

0 to 100 %RH


5 to 80 %RH: ±(1.8 %RH + 3 ) at +25 °C


0.1 %RH


General technical data


86.4 g


243 x 30 x 24 mm

Operating temperature

-20 to +50 °C

Product-/housing material


System requirements

requires iOS 8.3 or newer; requires Android 4.3 or newer;

requires mobile end device with Bluetooth 4.0

Product colour


Battery type

3 AAA micro batteries

Battery life

150 h

Length probe shaft

100 mm

Storage temperature

-20 to +60 °C