Testo 871 Thermal Imaging Camera



  • Up to 480 x 360 pixels with Testo SuperResolution
  • Measuring range -30 to +650 degrees Celsius
  • Automatic setting of emissivity
  • Works in connection with the Testo 605i and 770-3 clamp meter
(Size: 2.6 MB)
(Size: 2.2 MB)
More Information
Warranty 2 years
Price Match Yes
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Testo 871 Thermal Imaging Camera

The Testo 871 continues to build on the already impressive feature set of the Testo 865 and 868 thermal cameras. One of the most notable advantages is the larger infrared resolution of 240 x 180 pixels. This means the 871 takes its reading from 43,200 measurement points (172,800 with SuperResolution) as opposed to the 865 and 868’s 19,200 measurement points. This higher infra-red resolution provides a clearer presentation of the objects being measured.

The thermal sensitivity of the Testo 871 is 90mK, meaning the camera can detect smaller temperature differences than the Testo 865 and 868. This makes the 871 more suited to applications where spotting smaller temperature differences is required by the user. This may be for preventive maintenance measurement purposes where frequent monitoring of equipment is required.

The Testo 871 can be used in conjunction with the Testo 605i thermohygrometer to provide the value of the relative surface moisture. This is calculated from the ambient temperature and air humidity, automatically transferred in real time by the wireless humidity probe, and the measured surface temperature. For electrical application the Testo 871 can also be used in conjunction with the Test 770-3 clamp meter.

testo ScaleAssist: All models testo
testo ε-Assist: 868 / 871 and 872 only
testo thermography app: 868 / 871 and 872 only
Compatible with testo 605i and 770-3: 871 and 872 only

Integrated digital camera
See both the visual and thermal image simultaneously, allowing for faster troubleshooting as the user can see exactly where an issue may be occurring, even down to component level.

Testo ScaleAssist
This useful tool automatically optimises the thermal image scale for the best results. This helps prevent interpretation errors that can lead to false evaluations. ScaleAssist also makes the Testo 871 more accessible to a greater range of users, including those with limited experience of thermal imaging.

Measuring range
Choose from two selectable measuring ranges.
-30 to +100: Ideally suited to everyday measurement requirements.
0 to 650: High temperature range if required for more industrial applications.

The large temperature range makes the 871 a suitable choice for many building and electrical applications, but also industrial environments where high temperatures may be present.

Solar mode
If you have a separate irradiance meter, you can input the solar radiation value into the Testo 871. This value is then stored with every thermal image and is then available for evaluation in the analysis software included.

Testo ε assist
Via the integrated digital camera, the Testo 871 recognises the reference sticker (ε marker) and then automatically adjusts the emissivity setting depending on the emissivity and reflected temperature. This features helps reduce inaccurate measurements as a result of emissivity caused by user error. 3 ε markers are included with the Testo 871.

Go anywhere!
The Testo 871 is IP54 rated, making it a great choice for both indoor and outdoor use. It also comes with rechargeable batteries and a hard carry case, to protect the camera when not in use or while being transported.

Infrared image output
Infrared resolution 240 x 180 pixels
Thermal sensitivity 90 mK
Field of view (FOV) 35° x 26°
Minimum focus distance < 0.5m
Geometric resolution (IFOV) 2.6 mrad
Testo Super Resolution (Pixel / IFOV) 480 x 360 pixels (2.1 mrad)
Image refresh rate 9Hz
Focus Fixed focus
Spectral range 7.5 to 14 μm
Visual image output
Image size / min. focusing distance at least 3.1 MP / 0.5m
Image presentation
Image display 8.9 cm (3.5" TFT, QVGA (320 x 240 pixels)
Display options IR image / real image
Colour palettes Iron / rainbow HC / cold - hot / grey
Data interfaces
WLAN connectivity Communication with the testo Thermography App wireless modul BT/WLAN
USB 2.0 Micro B Yes
Bluetooth Measurement value transfer from thermohygrometer testo 605i, clamp meter testo 770-3 (optional)
Measuring range Measuring range 1: -30 to +100 °C
Measuring range 2: 0 to +650°C
Accuracy ±2 °C, ±2 % of measured value
Emissivity range 0.01 to 1
testo ε-Assist Auto recognition of emissivity and determination of reflected temperature (RTC)
Measurement Functions
Analysis function Mean point measurement, hot/cold-spot recognition, Delta T
testo ScaleAssist Included
IFOV warner Included
Humidity mode - manual Included
Humidity measurement
with humidity measuring instrument
Automatic measurement value transfer of thermohygrometer testo 605i via Bluetooth (instrument must be ordered separately)
Solar mode – manual Input of solar radiation value
Electrical mode - manual Input of current, voltage or power
Electrical measurement
with clamp meter
Automatic measurement value transfer of clamp meter testo 770-3 via Bluetooth (instrument must be ordedered separately)
Imager Equipment
Digital camera Included
Full screen mode Included
JPEG storage Included
Video Streaming Via USB, via wireless LAN with test Thermography app
Standard lens 35° x 26°
Image storage
File format .bmt; .jpg; export option in .bmp; .jpg; .png; .xls; .csv
Memory Internal memory (2.8GB)
Power supply
Battery type Li-ion battery can be charged on-site
Operating time 4 hours
Charging options In instrument / in charging station (optional)
Mains operation Yes
File format .bmt; .jpg; export option in .bmp; .jpg; .png; .xls; .csv
Ambient conditions
Operating temperature range -15 to +50 °C
Storage temperature range -30 to +60 °C
Air humidity 20 to 80 %RH non-condensing
Physical features
Weight 510 g
Dimensions (LxWxH) 219 x 96 x 95 mm
Housing PC - ABS
Housing protection class (IEC 60529) IP54


Testo thermal imaging comparison

  Testo 865 Testo 868 Testo 871 Testo 872
Infrared resolution (pixels) 160 x 120 160 x 120 240 x 180 320 x 240
SuperResolution resolution
320 x 240 320 x 240 480 x 360 640 x 480
NETD (thermal sensitivity) 120mK 100mK 90mK 60mK
Field of view (FOV) 31° x 23° 31° x 23° 35° x 26° 42° x 30°
3,4 mrad 3,4 mrad 2,6 mrad 2,3 mrad
Focus type Fixed focus Fixed focus Fixed focus Fixed focus
Min. focus distance < 0,5 m < 0,5 m < 0,5 m < 0,5 m
Intergrated digital camera No Yes Yes Yes
Laser marker No No No Yes
Measuring range -20 to +280°C -30 to +100°C
0 to +650°C
-30 to +100°C
0 to +650°C
-30 to +100°C
0 to +650°C

What’s included

  • Testo 871 Thermal Imager
  • USB Cable
  • Mains Unit
  • Lithium-ion rechargeable battery
  • Pro Software
  • Quick start guide
  • Short Instructions
  • Hard protective carry case
  • Calibration Protocol
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