testo 875i-2 - Adjustable focus thermal imager (160 x 120 FPA)

Order-Nr.  0563 0875 V2

  • Interchangeable telephoto lens for additional application usage

  • Built in digital camera with Twin Pix allows capture of both thermal captures, as well as digital images

  • SuperResolution Technology enhances image quality to 320 x 240

  • Advanced report writing and image analysis with included software

The testo 875i-2 is a feature packed adjustable lens thermal imager. The 875i-2 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, and optional 9° telephoto lens
  • <50 mK NETD sensitivity Included
  • 2GB SD card for storage
  • Lens Protection Glass (Optional)
  • High Temperature Option (1022 °F)
  • TwinPix image blending
  • SolarPanel Inspection
  • Isotherms
  • Voice Annotation
  • Customizeable Reporting Software
  • Meets all RESNET Standards


Delivery Scope

testo 875i-2 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
Ambient Condition

Storage temperature

-22 °F; 140 °F / -30 °C; 60 °C

Operating temperature

5 °F; 104 °F / -15 °C; 40 °C

Air humidity

20 to 80 %RH non-condensing

Housing protection class




Image output visual

Image size

640 x 480 pixels

Minimum focus distance

0.4 ft. / 0.4 m

Image presentation

Display type

3.5" LCD with 320 x 240 pixels

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)

Video output

USB 2.0

Imager equipment



Video streaming


Voice recording

wired headset

Exchangeable lenses

9° x 7°

Standard lens

32° x 23°

Digital camera




Imager storage

File format image

.bmt; software export option in .bmp; .jpg; .png; .csv; .xls

Storage device

SD card 2GB (approx. 2.000 images)

Infrared image output

Infrared resolution

160 x 120 pixels

Thermal sensitivity

50 mK

Field of view

32° x 23°

Minimum focus distance

0.1 m (Tele: 0.5 m)

Geometric resolution (IFOV)

3.3 mrad (Tele: 1.0 mrad)

SuperResolution (Pixel)

320 x 240 pixels

SuperResolution (IFOV)

2.1 mrad (Tele: 0.6 mrad)

Image refresh rate

9 Hz




Measuring range


High temperature measuring



±2 °C, ±2 % of m.v. (±3 °C of m.v. at -30 to -22 °C)

Reflected temperature


Accuracy high temperature

±3 % of m.v. at +350 to +550 °C

Measuring function

Surface moisture distribution


Humidity measurement


Solar mode


Analysis function

Up to 2 measurement points, hot/cold spot recognition, isotherms, area measurement (min/max on area)

PC software

System requirements

Windows XP (Service Pack 3); Windows Vista; Windows 7 (Service Pack 1); Windows 8; Interface: USB 2.0

Physical specification


6 x 108 x 262 / 152 x 108 x 262


31.747 oz. / 900 g

Tripod mounting




Power supply

Battery type

Fast-charging, Li-ion battery can be changed on-site

Operating time

4.0 hr

Charging options

In instrument / USB charger

Power supply


Termovisores garantia




$ 107.00
excl. tax

Downtime prevention in power generation

Conventional power generation plants, solar farms and power transmission lines use thermal cameras to prevent outages and monitor turbine and generator bearings, switch panels, transformers, solar panel defects, and potential overheating problems on the high voltage power line splices. Early problem identification helps to lower costs and downtime.

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.

Tracing pipe leaks

For the built-in piping, the piping leaks can be detected without breaking walls or floors. Testo thermal image will show precisely the location of defect in the work area.

Preventive QC in production process

Testo thermal cameras are used to confirm that production processes run as intended without anomalies in heat distribution or contamination with foreign bodies entering the production line. A quick scan with thermal camera assures that the process in normal state.

Checking for moisture damage

Damp areas are not necessarily caused by leaking pipes. Testo thermal image will help to discern between moisture damage caused by a high humidity / low ventilation environment, hidden rain seepage, leaking pipes, or other water drainage issues.

Fast and easy monitoring of filling levels

The level control in sealed fluid tanks has proven to be a sensible method for avoiding machine damage and as a result production losses. If, for example, the fluid in coolant tanks falls to a dangerously low level, machines are no longer being sufficiently cooled. They run hot and fail. Often, an automatic level control regulates the level of the refrigerant and issues an alarm if the fill level is too low. However, the automatic control can also fail. In this case, a regular look through a Testo thermal imager will also help.

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.