Testo 605i Gen 2 Smart Thermohygrometer operated with your smartphone - 0560 2605 02


0560 2605 02

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In conjunction with a smartphone or tablet, the compact testo 605i humidity measuring instrument is suitable for the measurement of air temperature and relative humidity in rooms and ducts. Cooling and heating output can also be determined in conjunction with the testo 405i thermal anemometer.

The compact testo 605i temperature and humidity measuring instrument with bendable probe head features professional measuring technology in an intelligent format: it can be used in conjunction with a smartphone/tablet and the testo Smart Probes App to reliably measure air temperature and humidity in rooms and ducts.

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.

Users can read off their measuring values conveniently via the testo Smart App installed on the terminal device. The App also enables the automatic determination of dewpoint and wet bulb temperature.

All measurement data are presented either as a diagram or a table. Finally, the measurement data reports can be sent directly as pdf or Excel files.


  • Measurement range of 0 to 100 %RH
  • Automatic calculation of wet bulb and dew point via Testo Smart App
  • Measurement of air humidity and temperature in rooms and ducts
  • Data analysis and recording via Testo Smart App on your smartphones/tablets
  • Easier to work on measuring points that are a long distance apart with up to 100 m Bluetooth range
  • Bendable probe head for particularly convenient measurements

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 are presented either as a diagram or a table. Finally, the measurement data report can be e-mailed directly as a pdf or Excel file.

*Our tip: Use the testo 605i as a probe in conjunction with the appropriate IAQ measuring instrument from Testo.


System requirements:

  • requires iOS 8.3 or newer
  • requires Android 4.3 or newer
  • requires mobile end device with Bluetooth 4.0


  • 1 x testo 605i thermohygrometer operated via smartphone,
  • Batteries
  • Calibration protocol


  •  Temperature - NTC
      • Measuring range: -20 to +60 °C
      • Accuracy:
        ±0.8 °C (-20 to 0 °C)
        ±0.5 °C (0 to +60 °C)
  • Humidity - Capacitive
      • Measuring range: 0 to 100 %RH
      • Accuracy:
        ±3.0 %RH (10 to 35 %RH) (at +25°C)
        ±2.0 %RH (35 to 65 %RH) (at +25°C)
        ±3.0 %RH (65 to 90 %RH) (at +25°C)
        ±5 %RH (< 10 %RH or > 90 %RH)
  • Operating temperature: -20 to +50 °C
  • Storage temperature: -20 to +60 °C
  • Length probe shaft: 100 mm
  • Data transfer: Bluetooth®
  • Radio range: 100 m
  • Battery type: 3 AAA micro batteries
  • Battery life: 150 h


Buy with 100% confidence knowing your purchase is backed by the full Manufacturer's Warranty. Please register your product with provided warranty card.


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