Products, Testo, Thermal Imagers

Thermal Imager – testo 865


The testo 865 thermal imager offers professional technology and concentrates on functions which are needed in a contractor’s daily work. The testo 865 is a user-friendly thermal imager, optimized for fast and efficient work. With the testo ScaleAssist functions ensuring optimum setting of the thermal image scale for building thermography and the IFOV warner making sure you avoid measurement errors, you will always generate the perfect infrared image.

Areas of application of the testo 865 thermal imager
Detect leaks, identify overheated connections, pinpoint thermal bridges or detect structural defects. The testo 865 thermal imager is ideal for applications in daily maintenance and installation work in trade and industry. It enables time-saving quality assurance and ensures reliable production control.

Technical highlights of the testo 865 thermal imager
The testo 865 thermal imager stands out thanks to its easy operation and has the following impressive technical features:

Very good image quality due to high resolution: 19,200 temperature measuring points ensure precise thermography. Infrared resolution of 160 x 120 pixels – via integrated SuperResolution Technology 320 x 240 pixels
Visualize temperature differences from 0.12°C
Critical temperature conditions are directly displayed via automatic hot-cold spot recognition
The IFOV warner means the distance from the measurement object / measurement spot size is determined and the measurement spot is shown on the thermal image – you therefore avoid measurement errors because the camera shows you exactly what you can measure
Pro software for image evaluation on the PC
You can choose to save thermal images as JPEGs


• Very good image quality: IR resolution of 160 x 120 pixels, via integrated testo SuperResolution Technology 320 x 240 pixels
• Very good measuring accuracy of ±2°C
• Very good image quality: IR resolution of 160 x 120 pixels, via integrated testo SuperResolution Technology 320 x 240 pixels
• Automatic detection of hot and cold spots

Delivery Scope

testo 865 thermal imager, including USB cable, mains unit, lithium-ion rechargeable battery, IRSoft professional software (free download), commissioning instructions, short instructions, calibration protocol and case.


Download Datasheet Instruction manual

Application Image

Technical Details

Infrared image output Focus: Fixed focus
Infrared resolution: 160 x 120 pixels
Image refresh rate: 9 Hz
SuperResolution (IFOV): 2.1 mrad
SuperResolution (Pixel): 320 x 240 pixels
Geometric resolution (IFOV): 3.4 mrad Minimum focus distance
Field of view: 31° x 23°
Thermal sensitivity: 120 mK
Spectral range: 7.5 to 14 µm
Image presentation Display option: IR image only
Colours: 4 (iron, rainbow, cold-hot, grey)
Display type: 8.9 cm (3.5″”) TFT, QVGA (320 x 240 pixels)
Measurement Reflected temperature: manual
Measuring range: -20 to +280 °C
Accuracy: ±2 °C, ±2 % of mv
Emissivity: 0.01 to 1
Measuring function Analysis function: Mean point measurement, hot/cold-spot recognition, Delta T
testo ScaleAssist: Included
IFOV warner: Included
Imager equipment Full screen mode: Included
JPEG storage: Included
Video streaming: via USB
Standard lens: 31° x 23°
Interface: USB 2.0 Micro B
Imager storage File format image: .bmt; .jpg; export option in .bmp; .jpg; .png; .xls; .csv
Storage device: Internal Memory (2.8 GB)
Power supply Battery type: Fast-charging, Li-ion battery can be changed on-site
Operating time: 4 h
Mains operation: yes
Ambient Condition Housing protection class: IP54
Vibration: 2G
Air humidity: 20 to 80 %RH non-condensing
Storage temperature: -30 to +60 °C
Operating temperature: -15 to +50 °C
Physical specification Product-/housing material: PC – ABS
Weight: 510 g
Dimensions: 219 x 96 x 95 mm
PC software System requirements: Windows® 10; Windows® 8; Windows® 7
Standards, tests, warrenty EU-/EG-guidelines: EMC: 2014/30/EU
Product colour: Black
Display ligthing: bright / normal / dark