testo 605i - Thermohygrometer operated via smartphone

Order-Nr.  0560 2605 03

  • Measurement of air humidity and temperature in rooms and ducts

  • Automatic calculation of the dew point and wet bulb temperature via testo Smart App

  • Live data feed integration now available with the MeasureQuick App

  • Problem-free application at measuring points that are a long distance apart thanks to Bluetooth® range up to 350 ft.

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 App to reliably measure air temperature and humidity in rooms and ducts.


Product Description

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 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.

Delivery Scope

1 x testo 605i thermohygrometer operated via smartphone, including batteries and certificate of conformity

Related products

Technical Data

Temperature - NTC

Measuring range

-4° to 140 °F / -20 to +60 °C


±1.4 °F (-4° to 32 °F) / ±0.8 °C (-20 to 0 °C)

±0.9 °F (32° to 140 °F) / ±0.5 °C (0 to +60 °C)


0.1 °F / 0.1 °C

Humidity - Capacitive

Measuring range

0 to 100 %rH


±3.0 %rH (10 to 35 %rH) (at +77°F) / ±3.0 %RH (10 to 35 %RH) (at +25°C)

±2.0 %rH (35 to 65 %rH) (at +77°F) / ±2.0 %RH (35 to 65 %RH) (at +25°C)

±3.0 %rH (65 to 90 %rH) (at +77°F) / ±3.0 %RH (65 to 90 %RH) (at +25°C)

±5 %rH (< 10 %rH or > 90 %rH)


0.1 %rH

General technical data


3.05 oz. / 86.4 g


10 x 1 x 1 in. / 243 x 30 x 24 mm

Operating temperature

-4° to 122 °F / -20 to +50 °C



System requirements

requires iOS 11.0 or newer; requires Android 6.0 or newer; requires mobile end device with Bluetooth 4.0

Product colour


Battery type

3 x AAA

Battery life

150 h

Length probe shaft

3.937 in. / 100 mm

Storage temperature

-4° to 140 °F / -20 to +60 °C



$ 75.00
excl. tax
$ 45.00
excl. tax