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Testo 905i

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The Testo 905i smart probe Type K thermometer is a temperature measuring device that links to smart phones and tablet devices to display and log measurement data. The product is suitable for use in both rooms and ductwork across a temperature range of - 50 to + 150 oC (excludes handle)

The Testo smart probes can be used individually or combined with other smart probes to create measuring solutions for most HVAC / HVAR applications.


The Testo 905i works on smart devices with either Android or Apple operating systems. The App is a powerful and easy-to-use tool that allows you to remotely read measurements from up to six (6) smart devices. All measurement data is displayed as instrument readings, tables, or graphs. The measurements can be quickly saved as PDF or Excel files. The App creates custom reports which can be saved and / or shared by email.


Temperature sensor type Type K (NiCr-Ni)

Temperature measuring range - 50 to + 150 °C

Temperature accuracy ± 1.0 °C

Temperature resolution 0.1 °C

Testo smart App system requirements Mobile device requires iOS 8.3 or newer, or Android 4.3 or newer operating systems; Device also needs Bluetooth 4.0 capabilities

Warranty 2 years

Battery type x3 AAA batteries

Support documents

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Testo smart probe user manual.pdf Testo smart probe user manual
Technical document
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Adobe Acrobat
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