Products, Testo, Thermal Imagers

Thermal Imager with Digital Camera – testo 875i


We developed the testo 875-2i thermal imager with built-in digital camera to make your work in industrial and building thermography even easier, quicker and more efficient!

You can carry out completely non-destructive tests on materials and components in industrial thermography with the testo 875-2i. This high temperature thermal imager gives an option to extend the measuring range from +350 °C to +550 °C. Using the built-in digital camera, you can create a real image in parallel to the thermal image. So as to make the documentation and assignment of real and thermal images even easier for you, the testo 875-2i thermal imager is also equipped with voice recording. This means you can save comments to go with your images using the headset.

The testo 875-2i thermal imager’s technical features
The testo 875-2i thermal imager is not only characterised by its intuitive operation. It also simplifies professional industrial and building thermography and has the following impressive features:
– Built-in digital camera with power LEDs: Recording real images in parallel to each infrared image makes documentation and assignment easier. The built-in power LEDs guarantee optimum illumination of dark areas
– Voice recording included: You can save comments to go with your images using the headset
– Resolution and image quality: Detector size 160 × 120 pixels = 19,200 temperature measuring points
– *SuperResolution Technology (optional) enables you to take image quality right up to the next level of 320 × 240 pixels in next to no time. Four times as many readings and a geometric resolution that has been improved by a factor of 1.6 mean you get even more detail and even greater reliability with thermographic measurements
– Thermal sensitivity < 50 mK: Thanks to a temperature resolution of < 50 mK, even the smallest temperature differences can be seen - High-quality 32° × 23° lens: The lens with its manual focusing enables a wide field of view and an ideal overview of the temperature distribution, along with precise focusing on the object being measured - 9° × 7° telephoto lens: Record very distant objects precisely with the exchangeable 9° × 7° telephoto lens (optional) - Automatic hot/cold spot detection: Critical temperature conditions are directly displayed during thermography - Special measuring mode for detecting areas with a risk of mould for building thermography: The dew point in the room is calculated by manual entry of the ambient temperature and humidity. The surface temperature value measured by the infrared camera is then compared to the dew point. The display now shows the risk of mould in traffic light colours (red, yellow and green). It is easier with the radio humidity probe: Automatic transmission of readings means that manual input of humidity and ambient temperature is no longer needed - Solar mode: The solar radiation value can be input into the infrared camera and stored with each infrared image - Pro software for image evaluation on the PC included. You can also choose to save the infrared images as JPEGs. - Standard measuring range from -30 to +350 °C. The high temperature option enables flexible extension of the measuring range for industrial thermography up to +550 °C


Very good image quality: Resolution 160 × 120 pixels / 320 × 240* pixels
Thermal sensitivity < 50 mK
Very good image quality: Resolution 160 × 120 pixels / 320 × 240* pixels
Including a built-in digital camera and voice recording via a headset

Delivery Scope

The testo 875-2i thermal imager with digital camera is supplied together with the following accessories:
– Robust case
– Pro software for image evaluation on the PC
– Soft case
– Carrying strap for the Infrared camera
– SD memory card
– USB cable for data transfer to PC
– Lens cleaning cloth
– Mains unit
– Li-ion battery
– Adapter for tripod mounting
– Headset for voice recording

In the event of retrofitting, please contact our customer service for the following options:

– 9° × 7° telephoto lens (order code: A1)
– High temperature measurement up to 550 °C (order code: G1)
– Humidity measurement with radio humidity probe (order code: B1)


Download Datasheet Instruction manual

Application Image

Technical Details

Infrared image output Focus: manual
Infrared resolution: 160 x 120 pixels
Image refresh rate: 33 Hz
SuperResolution (IFOV): 2.1 mrad (Tele: 0.6 mrad)
SuperResolution (Pixel): 320 x 240 pixels
Geometric resolution (IFOV): 3.3 mrad (Tele: 1.0 mrad)
Minimum focus distance: 0.1 m (Tele: 0.5 m)
Field of view: 32° x 23°
Thermal sensitivity: ˂ 50 mK at +30 °C
Image output visual Minimum focus distance: 0.4 m
Image size: 640 x 480 pixels
Image presentation Display option: IR image only; real image only; IR image / real image
Number of colours: 10
Colours: 10 (iron, rainbow, rainbow HC, cold-hot, blue-red, grey, inverted grey, sepia, Testo, iron HT)
Display type: 3.5″” LCD with 320 x 240 pixels
Video output: USB 2.0
Measurement Reflected temperature: manual
Measuring range: -30 to +100°C; 0 to +350 °C (switchable)
High temperature measuring: +350 to +550 °C
Accuracy: ±2 °C, ±2 % of m.v. (±3 °C of m.v. at -30 to -22 °C)
Accuracy high temperature: ±3 % of m.v. at +350 to +550 °C
Measuring function Surface moisture distribution: Included
Humidity measurement: Optional
Solar mode – manual: Included
Analysis function: Up to 2 measurement points, hot/cold spot recognition, isotherms, area measurement (min/max on area)
Imager equipment Digital camera: Included
Video streaming: Included
Voice recording: wired headset
Laser: Included
Exchangeable lenses: 9° x 7°
Standard lens: 32° x 23°
Power-LED: Included
Imager storage File format image: .bmt; export option in .bmp; .jpg; .png; .csv; .xls
Storage device: SD card 2GB (approx. 2.000 images)
Power supply Battery type: Fast-charging, Li-ion battery can be changed on-site
Operating time: 4 h
Charging options: In instrument / charger (optional)
Mains operation: yes
Ambient Condition Storage temperature: -30 °C; 60 °C
Operating temperature: -15 °C; 40 °C
Housing protection class: IP54
Vibration: 2G
Air humidity: 20 to 80 %RH non-condensing
Physical specification Weight: 900 g
Tripod mounting: M6
Housing: ABS
Dimensions: 152 x 108 x 262
PC software System requirements: Windows XP (Service Pack 3); Windows Vista; Windows 7 (Service Pack 1); Windows 8; Interface: USB 2.0
Standards, tests, warrenty EU-/EG-guidelines: 2004/108/EG