The new Testo 860i wireless thermal imager for smartphones
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860i Thermal Imager
The Testo 860i is a compact, smart thermal imager designed for fast, accurate temperature diagnostics. With high‑quality thermal resolution, intuitive app connectivity, and real‑time analysis tools, it makes professional inspections easier, clearer, and more efficient.
Simply versatile in application
Heating Systems
Heaters can be tested very quickly with the testo 860i. The DeltaHeat measuring program helps you to determine the spread of flow and return temperatures on radiators.
In the event of anomalies, information on possible causes and a suggested solution based on the Delta T are provided.
Want to see the 860i Thermal Imager in action?
Thermal Imaging Expert, Brent Lammert, takes us through 3 of the live demonstrations our team put on at the 2026 AHR Expo in Las Vegas. Between identifying hidden leaks, locating hot spots, or finding the liquid level of an accumulator, the 860i is an essential tool for all technicians needing quick and accurate scans.
Testo Smart App - Everything Made Simple
With the free testo Smart App, you can easily operate the testo 860i thermal imager. It connects very quickly to the smartphone or tablet.
The thermal images are clearly displayed in the app and can be easily edited in the thermography measurement program. You are also supported with other application-specific measurement programs:
DeltaHeat for quickly determining the spread of flow and return temperatures on radiators.
DeltaCool for quick determination of the differential temperature on air conditioning/refrigeration systems with step-by-step instructions.
Humidity mode for assessing the risk of mold in buildings using the traffic light principle.
Documentation can also be conveniently and effortlessly managed with the app. Direct sharing of the images or creating and sending a report as a PDF can be done quickly.
Testo Smart App - One App for Everything
The testo Smart App brings all Testo tools and measurements together. For example, you can integrate the testo 770-3 clamp meter or the testo 605i thermohygrometer for your application.
Benefit from intelligent connectivity and the all-in-one solution for all applications. So that not only thermography is dealt with smartly and effortlessly.
Welcome to the testo Smart World.
Built for Pros: Powerful Tools for Contractors and Technicians
Built for Pros: Powerful Tools for Contractors and Technicians
Thermography with testo 860i saves time, makes you more efficient and more flexible.
Simple & fast determination of Delta T directly in the thermal image using application-specific measuring programs.
Razor-sharp thermal images thanks to high IR resolution (256 x 192 pixels).
Easy operation & effortless documentation with the testo Smart App.
Flexible use thanks to wireless use and clip for attaching directly to mobile phone/tablet.
High suitability for everyday use and robustness with IP54, drop resistance up to 1.5 m and USB-C connection.
Immediately ready to go with the testo 860i thermal imager.
And the free testo Smart App.
Connectivity:
These measuring instruments are all compatible with the testo Smart App.