testo 871 - thermal imager with App

  • Very good image quality: IR resolution of 240 x 180 pixels, via integrated testo SuperResolution Technology 480 x 360 pixels

  • Wireless networking: wireless transmission of readings from the testo  770-3 clamp meter and the testo 605i thermohygrometer (both available  separately)

  • Smart: the free testo Thermography App enables you to write and send  reports on site, as well as saving them online, and lots more.

  • Large temperature measuring range from -30°C to +650°C

The testo 871 thermal imager combines high infrared resolution with professional measuring performance and easy handling. Its high-quality pixel detector, an integrated digital camera and, last but not least, the innovative functions are the features that impress. The testo Thermography App enables the testo 871 to offer smart thermography to meet professional requirements in industry and trade. The case supplied with the thermal imager means it can be conveniently transported, so it  is always there for you when needed.

testo 0560 8712

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The testo 871 thermal imager was developed with experienced professionals to enable you to work quickly and easily with professional thermal imaging technology. You can generate error-free and objectively comparable infrared images using its handy functions. The IFOV warner, testo ɛ-Assist and testo ScaleAssist mean you can avoid measurement errors and not only effortlessly achieve optimum setting of emissivity (ɛ) and reflected temperature (RTC) for building thermography, but also of colour scale.

The testo 871 thermal imager– smart and networked

The testo 871 thermal imager communicates wirelessly via WLAN with your mobile terminal devices. The testo Thermography App for iOS and Android offers you the possibility of writing and sending reports on site, as well as saving them online, and of using your smartphone or tablet as a second display or for remote control.

The testo 871 delivers even more informative thermal images in combination with the compatible 770-3 clamp meter and the testo 605i thermohygrometer. Both are available separately – simply order them straight away along with your testo 871. The measurement results of both measuring instruments can easily be transmitted via Bluetooth. The additional output, current and voltage values of the testo 770-3 clamp meter enable better interpretation of measured temperatures. Measure the air temperature and humidity with the testo 605i and easily detect locations at risk of developing mould using the special humidity palette in the thermal imager via the traffic light principle.

Areas of application of the testo 871 thermal imager

Detect leaks, pinpoint thermal bridges, discover structural defects, identify overheated connections or assess mould damage. The testo 871 thermal imager is ideal for applications in daily maintenance and installation work in trade and industry. Quick, simple and reliable for maintenance and detection of defects.

Technical highlights of the testo 871 thermal imager

Really simple operation with impressive professional thermal imaging technology: the testo 871 thermal imager has the following impressive features:


  • Very good image quality due to high resolution: 43,200 temperature measuring points for precise thermography. Infrared resolution of 240 x 180 pixels – extendible to 480 x 360 pixels via integrated SuperResolution Technology
  • Detecting temperature differences from 0.09°C
  • The testo Thermography App enables you to write reports on site, save them online and send them by e-mail, as well as allowing you to use mobile terminal devices as a second display or for remote control
  • Wireless communication thanks to Bluetooth – this means you can also wirelessly integrate the readings of the compatible testo 770-3 clamp meter and testo 605i thermohygrometer
  • Built-in digital camera generates a real image in parallel to the thermal image
  • Critical temperature conditions are directly displayed via automatic hot-cold spot recognition
  • The testo ScaleAssist automatically ensures optimum setting of the thermal image scale, which means you generate objectively comparable and error-free thermal images, for example of the thermal insulation behaviour of buildings
  • The testo ɛ-Assist ensures the correct measurement result by automatically determining and setting the emissivity and reflected temperature
  • 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


testo 871 thermal imager with radio module for Bluetooth/WLAN, USB cable, mains unit, lithium-ion rechargeable battery, pro software IRSoft (free download), 3 x testo ε-Markers, commissioning instructions, short instructions, calibration protocol and case.


Infrared image output
                            Fixed focus
Infrared resolution
                            240 x 180 pixels
Image refresh rate
                            9 Hz
SuperResolution (IFOV)
                            1.6 mrad
SuperResolution (Pixel)
                            480 x 360 pixels
Geometric resolution (IFOV)
                            2.6 mrad
Minimum focus distance
                            <0.5 m
Field of view
                            35° x 26°
Thermal sensitivity
                            90 mK
Spectral range
                            7.5 to 14 µm


Image output visual
Minimum focus distance
                            0.5 m
Image size
                            at least 3.1 MP


Image presentation
Display option
                            IR image / real image
                            4 (iron, rainbow, cold-hot, grey)
Display type
                            8.9 cm (3.5") TFT, QVGA (320 x 240 pixels)


Reflected temperature
testo ε-Assist
Measuring range
                            -30 to +100 °C; 0 to +650 °C
                            ±2 °C, ±2 % of mv
                            0.01 to 1


Measuring function
Solar mode – manual
                            Input of solar radiation value
Analysis function
                            Mean point measurement, hot/cold-spot recognition, Delta T
Humidity measurement with humidity measuring instrument
                            Automatic measurement value transfer of  thermohygrometer testo 605i via Bluetooth (instrument must be ordered  separately); Wireless permit in EU, EFTA, USA, Canada, Australia, Turkey
testo ScaleAssist
Humidity mode - manual
IFOV warner
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); Wireless permit in EU, EFTA, USA, Canada, Australia, Turkey


Imager equipment
Digital camera
Full screen mode
JPEG storage
Video streaming
                            via wireless LAN with testo Thermography App
Standard lens
                            35° x 26°
                            USB 2.0 Micro B
WLAN Connectivity
                            Communication with the testo Thermography App wireless module BT/WLAN (EU, EFTA, USA, AUS, CDN, TR)
                            Measurement value transfer from  thermohygrometer testo 605i, clamp meter testo 770-3 (optional);  Wireless permit in EU, EFTA, USA, Canada, Australia, Turkey


Imager storage
File format image
                            .bmt; .jpg; export option in .bmp; .jpg; .png; .csv; .xls
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


Ambient Condition
Housing protection class
Air humidity
                            20 to 80 %RH non-condensing
Storage temperature
                            -30 to +60 °C
Operating temperature
                            -15 to +50 °C


PC software
System requirements
                            Windows® 10; Windows® 8; Windows® 7


Standards, tests, warrenty
                            RED: 2014/53/EU; EMC: 2014/30/EU


General technical data
Product colour
Display ligthing
                            bright / normal / dark


Physical specification
Product-/housing material
                            PC - ABS
                            510 g
                            219 x 96 x 95 mm

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