The Laser TEMP-GUN™ M12™ Cordless Lithium-Ion Thermometer for HVAC/R is a heavy duty pistol grip infrared thermometer for professional commercial and industrial HVAC/R applications. Powered by the Milwaukee M12 REDLITHIUM ™ battery, the 2277-20 can safely measure temperatures between -22 to 1472° F (-30 to 800° C) with a 40 to 1 distance to spot ratio for even the most demanding industrial applications.