Technical parameters of testo 810 infrared thermometer:
temperature
Range -30 to+300 ℃
Resolution 0.1 ℃
Accuracy ± 2.0 ℃ (-30~+100 ℃)
± 2% measurement value (other ranges)
Optical resolution 6:1
Unit ℃/℉
air temperature
Range -10 to+50 ℃
Resolution 0.1 ℃
Accuracy ± 0.5 ℃
Unit ℃/℉
Operating temperature -10 to+50 ℃
Battery type: alkaline battery (2 AAA)
Battery life of 50 hours (normal use, backlight off)
Size (including protective cover) 119 × 46 × 25 mm
The set includes factory calibration certificate, hanging rope, leather cover, protective cover, battery

The main features of the testo 810 infrared thermometer are:
Combining air temperature and infrared surface temperature measurement into one
1) Infrared temperature measurement, 1-point laser aiming, optical resolution 6:1;
2) Air temperature measurement;
3) Display temperature differences, such as the temperature difference between windows and indoor air;
4) Reading lock function and maximum/minimum value display.