The Testo 810 measures both non-contact surface temperature and ambient air temperature simultaneously. This dual capability enables applications such as comparing radiator surface temperature to room air temperature to gauge heating system efficiency.

IR measurement range is -22 to 572°F with ±2°C accuracy; air temperature range is 14 to 122°F with ±0.5°C accuracy. Features include 6:1 D:S, adjustable emissivity, built-in laser, hold function, min/max values, and display illumination.