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testo 871s - Thermal imager (240 x 180 pixels, App)

0560 8716
$ 2,716.52
  • Image quality with IR resolution of 240 x 180 pixels (480 × 360 pixels with testo SuperResolution technology)
  • Thermal sensitivity of 0.14 °F (0.08 °C)
  • Recording and documentation of ambient conditions with the testo 605i Smart Probe Thermohygrometer
  • Free analytical software for creating professional reports
  • Fast measurement with fixed focus
  • App for analysis and creating on-site measurement reports
  • The testo 871s 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 871s 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.
    • Image quality with IR resolution of 240 x 180 pixels (with testo SuperResolution technology 480 × 360 pixels)

    We developed the testo 871s thermal imager together with our 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 871s thermal imager– smart and networked

    The testo 871s thermal imager communicates wirelessly via Wi-Fi 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 871s delivers even more informative thermal images in combination with the compatible testo 605i thermohygrometer. The measurement results of the testo 605i can easily be transmitted via Bluetooth. Measure the air temperature and humidity with the testo 605i and easily detect locations at risk of developing mold using the special humidity palette in the thermal imager via the traffic light principle.

    Areas of application of the testo 871s thermal imager

    Detect leaks, pinpoint thermal bridges, discover structural defects, identify overheated connections or assess mold damage. The testo 871s 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 871s thermal imager

    Really simple operation with impressive professional thermal imaging technology: the testo 871s thermal imager has the following impressive features:
    • Great 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 0.14°F (0.08°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 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 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 871s thermal imager with radio module for Bluetooth/Wi-Fi, USB cable, power supply, lithium-ion rechargeable battery, pro software IRSoft (free download), 3 x testo ε-Markers, commissioning instructions, short instructions, calibration protocol and case.


    RED: 2014/53/EU; EMC: 2014/30/EU

    Infrared image output

    Field of view
    35° x 26°
    Fixed focus
    Minimum focus distance
    <1.6 ft (0.5 m)
    Geometric resolution (IFOV)
    2.6 mrad
    Image refresh rate
    9 Hz
    Infrared resolution
    240 x 180 pixels
    SuperResolution (IFOV)
    1.6 mrad
    SuperResolution (Pixel)
    480 x 360 pixels
    Thermal sensitivity
    < 0.14 °F (0.08 °C) (80mK)
    Spectral range
    7.5 to 14 µm

    Image output visual

    Minimum focus distance
    min. 0.5 ft. / min. 0.5 m
    Image size
    5 MP

    Detecting structural defects and ensuring building quality (also for images of the building shell)

    Analysis with the Testo thermal imager is a fast and efficient method of detecting possible structural defects. Furthermore, the thermal imager is also ideally suited for providing proof of the quality and correct implementation of construction measures. Any heat losses, humidity and lack of air tightness arising in a building are visible in the thermal image. The Testo thermal imager offers the possibility of detecting structural damage and implementation defects in the thermal insulation – all using a non-contact method! The testo ScaleAssist function, which automatically ensures optimum setting of the thermal image scale, means you get objectively comparable thermal images of buildings. This makes correct assessment of structural defects and thermal bridges easier than ever before. Detecting insulation defects and thermal bridges in the building shell is one of the typical applications.
    Thermal imager testo 871 - Detecting structural defects and ensuring building quality

    Carrying out detailed energy consultancy

    In building thermography, infrared technology is ideally suited for the fast and effective analysis of energy losses in the heating or air conditioning of buildings. Thanks to its high temperature resolution, the thermal imager provides detailed images of inadequate insulation and thermal bridges. It is impressive in terms of recording and documenting energy losses on outer windows and doors, roller blind casings, radiator niches, roof constructions or the entire building shell. The thermal imager is the best measuring instrument for comprehensive diagnostic and maintenance uses and always a good choice when it comes to energy consultancy.
    Thermal imager testo 872 - Energy consultancy

    Support in preventive maintenance

    Reliable early detection of damage to production-relevant systems is essential in order to guarantee the safety and reliability of the system and prevent costly downtimes. Problematic areas in electrical and mechanical production facilities usually become evident due to an increase in temperature of the affected components. You can use a thermal imager to detect critical heat conditions (known as hotspots) in your system directly during operation, therefore guaranteeing an additional bonus in terms of reliability. Typical applications for the thermal imager:
    • Quick location of hotspots in electrical installations
    • Detection of critical heat conditions in engines, shafts and bearings
    testo 865

    Easy checking of heating systems and installations

    Heating, ventilation and air conditioning systems can be quickly and reliably checked thanks to the easy and intuitive operation of the Testo thermal imager. Just a quick look with the thermal imager is enough to discover irregularities in temperature distribution. Thermography can therefore be used to easily locate clogged radiators and leaks.

    Typical applications for the thermal imager:
    • Pinpointing the course of heating loops in an underfloor heating system
    • Checking radiators for silting
    • Measuring the flow and return temperature
    Thermal imager testo 871 - Checking of heating systems and installations

    On the trail of a ruptured pipe

    If a pipe rupture is suspected, the only solution left is often to break open entire wall or flooring areas. The thermal imager enables you to minimize damage and reduce costs, because you locate precise leaks in underfloor heating and other inaccessible pipelines. This avoids opening up walls and floors unnecessarily and considerably reduces the repair costs.

    Preventing mould formation

    Thermal bridges waste energy. Condensation can also form in these places due to humidity in the ambient air. As a result, mould develops in these areas with the associated health risks for the occupants. The thermal imager uses the ambient temperature and humidity, determined externally with the testo 605i Smart Probe, along with the measured surface temperature to calculate the value of the relative surface moisture for each measuring point directly in the measuring instrument. Mould formation is therefore shown on the display before it becomes visible: areas at risk are displayed in red, those not at risk in green. This makes it possible to introduce measures to prevent dangerous mould formation in good time - including in hidden corners and alcoves.
    Thermal imager testo 871 - Preventing mould formation

    Testing the air tightness of new builds

    If doors or windows are not correctly fitted, in winter cold air can enter or warm indoor air can escape. This results in draughts, increased ventilation heat loss and above all high energy costs. The combination of thermography and Blower Door has really proved its worth. This procedure involves creating a negative pressure in the building, so that cool outside air can flow into the interior of the building through leaky joints and cracks. A Testo thermal imager makes the detection of the leaks considerably easier here. Any leaks are located – before facings and fittings for the new build make repair work complicated and costly.