testo 875i-1 - Adjustable focus thermal imager (160 x 120 FPA)

Order-Nr.  0563 0875 V1

  • Solar mode identifies solar intensity values

  • SuperResolution Technology enhances image quality to 320 x 240

  • Automatic hot/cold spot recognition

  • Advanced report writing and image analysis with included software

The testo 875i-1 is a feature packed adjustable lens thermal imager. The 875i-1 is an ideal solution for for a variety of industrial applications including thermal imaging inspection, as well as solar panel inspection.

Product Description

Amazing image quality right out of the box, with extreme sensitivity and expandable resolution option (using IRSoft Imaging software), this thermal imager provides the right amount of power and flexibility to provide quality thermal imaging at a very affordable value. The high sensitivity 50mK and 160 x 120 resolution make this extremely versitile for thermal imaging inspection.

  • Large 3.5“ LCD Screen
  • Easy 1-Button control
  • Quality resolution (160 x 120)
  • Patented SuperResolution provides 320 x 240 resolution images when downloaded to IRSoft
  • 32° wide angle lens
  • <50 mK NETD sensitivity
  • Lens Protection Glass (Optional)
  • Solar Panel Inspection
  • Included 2GB SD card for storage
  • TwinPix image blending
  • Customizeable Reporting Software
  • Meets all RESNET Standards


Delivery Scope

testo 875i-1 adjustable lens thermal imager, hard shell storage case, 2 GB SD memory card, USB Cable, Pro software IRSoft (free download), power supply, battery, instruction manual, and Certificate of Conformity
Infrared image output



Infrared resolution

160 x 120 pixels

Image refresh rate

33 Hz

SuperResolution (IFOV)

2.1 mrad (Standard lens)

SuperResolution (Pixel)

320 x 240 pixels

Geometric resolution (IFOV)

3.3 mrad (Standard lens)

Minimum focus distance

0.1 m (Standard lens)

Field of view

32° x 23°

Thermal sensitivity

50 mK

Image output visual

Minimum focus distance

1.312 ft. / 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 colors


Color palettes

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


Reflected temperature


Measuring range



±2% of reading

Measuring function

Surface moisture distribution

Not included

Humidity measurement

Not included

Solar mode


Analysis function

Up to 2 measurement points, hot/cold spot recognition

Imager equipment

Digital camera


Video streaming




Standard lens

32° x 23°


Not included

Imager storage

File format image

.bmt; software 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 hr

Charging options

In instrument / USB charger

Power supply


Ambient Condition

Storage temperature

-22 °F; 140 °F / -30 °C; 60 °C

Operating temperature

5 °F; 104 °F / -15 °C; 40 °C

Housing protection class




Air humidity

20 to 80 %RH non-condensing

Physical specification


31.747 oz. / 900 g

Tripod mounting





6 x 4 x 262 / 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




$ 101.00
excl. tax

Preventive mechanical maintenance

To maintain safety and reliability of machines, thermal imaging is used to identify problem components showing elevated stress levels caused by friction, misalignment, or internal damage. The high temperature resolution Testo thermal images will identify problem areas. For example, failing bearings will show clearly their location in the thermal image. Preventive maintenance can be scheduled then between the shifts to eliminate production downtime.

Electrical maintenance checks

Testo thermal cameras are used to spot overheating components in the low, medium, and high voltage systems. Thermal images help to locate parts that are either failing or exposed to imbalanced loads. Routine thermal scans are used to prevent outages and fire risks.

Location of structural defects in buildings

Testo thermal cameras are used for speedy detection of structural problems in the new and old buildings. Roof leaks are often located away from the dripping water, and hard to trace windows permeability, or the mold hazard areas come clear in thermal images. Testo thermal cameras are ideal to investigate heat loses, thermal bridges and missing insulation.

Precisely locating roof leaks

Damp areas in the roof structure, in particular in flat roofs, store the warmth from the sun for longer than intact areas. This means the roof structure cools unevenly in the evenings. Testo thermal imagers use these temperature differences to pinpoint the exact roof areas with trapped moisture or damaged insulation.

Troubleshooting HVAC installations

HVAC technicians save time finding silting blockage points in radiators using Testo thermal images. Thermal imaging helps to diagnose the AC, heating and ventilation systems bearings, pumps, tank levels, heat distribution issues, and find moisture collection points in the ventilation ducts.

Carrying out energy consultation

In building thermography, thermal imagers are ideal for quick, easy visualization of energy losses in the heating or air conditioning systems of buildings. Thanks to their high temperature resolution, Testo thermal imagers provide a detailed presentation of inadequate insulation and thermal bridges in the building shell. Thermal imagers are ideal for recording and documenting energy losses on outer windows and doors, roller blind casings, radiator niches, roof structures or the entire building shell. Comprehensive diagnosis can therefore be carried out to analyze energy efficiency, and structural improvement measures can be initiated.

Detailed energy consultancy, where the whole building shell is analyzed for its energy loss, effectively indicates further possibilities for energy saving.

Typical applications for the thermal imager:

  • Analyzing building shells
  • Easy to use in conjunction with Blower Door