Products, Smart Probes, Testo

Smart Thermometer – testo 905i


Testo 905i compact thermometer, optimized for Smartphone is ideal for checking ambient temperatures and temperatures in ducts and at air outlets quickly, easily and professionally.

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


• 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

Delivery Scope

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


Download Datasheet Instruction manual

Application Image

Technical Details

Temperature – TC Type K (NiCr-Ni)
Measuring range -50 to +150 °C
Accuracy ±1 °C
Resolution 0.1 °C

General technical data
Weight 82.2 g
Dimensions 222 x 30 x 24 mm
Operating temperature -20 to +50 °C
Product-/housing material Plastic
System requirements requires iOS 8.3 or newer; requires Android 4.3 or newer;
requires mobile end device with Bluetooth 4.0
Product colour black/orange
Battery type 3 AAA micro batteries
Battery life 150 h
Length probe shaft 100 mm
Storage temperature -20 to +60 °C