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Smart Thermometer - Testo 905i


The compact testo 905i professional thermometer, in conjunction with a smartphone or tablet, is ideal for measuring ambient temperature as well as temperatures in ducts and at air outlets. Instant overview of all temperature changes.
The innovative Testo measuring technology can be connected to your own smartphone or tablet really easily: with the testo Smart Probes App installed on your terminal device, you can view your readings conveniently. All measurement data is displayed either as a chart or in table form, and can be logged and then 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 temperature in rooms, ducts and at air outlets

  • Fast identification of temperature changes by graph curve display

  • 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 905i thermometer with smartphone operation, including batteries and calibration protocol.

Technical Details:

Temperature - TC Type K (NiCr-Ni)

Measuring range

-50 to +150 °C


±1 °C


0.1 °C

General technical data


82.2 g


222 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