Testo 810 Pocket-sized Temperature MeasuringThe Testo 810 simultaneously measures ambient air and surface temperature via infrared sensors at the touch of a button. For example the 810 thermometer can take a non contact surface temperature of a radiator, or air vent and compare it with the air temperature of the room at the same time. The 810 features a 1 point laser sighting and 6: 1 optics ratio, it's also very compact, convenient and easy to operate. Key Features: Thanks to its handy design,