The Cooper Atkins 422 Infrared Gun Style Thermometer Using an infrared thermometer is the safest way to measure surface temperatures of hot, hard to reach, electrically energized or moving objects. With a 1 second response time, it is commonly used to verify HVAC distribution, check for overheated wires, radiant heat in floors, running motors, insulation, pipes, breakers, and corroded connections. They are also excellent tools for reading ceiling duct temperatures from the floor without a ladder! 8 point laser ClassII laser which is always enabled while measuring. Thermometer has an auto shut off after 15 seconds of non-use, and its LCD screen with backlight is always on while measuring. Made of ABS plastic and includes (2) AAA batteries with a battery life of 18 hrs typ / 14 hrs min continuous use.T emperature range laser: -76 to 932°F/°C, 12:1 optics. External thermocouple probe jack.