Measure surface temperature with precision and accuracy with the AcuRite Non-Contact Infrared Thermometer. Whether you're checking for a faulty thermostat under the hood of your car, measuring the efficiency of your HVAC system, or spotting drafty windows, this premium infrared thermometer gun reliably measures a wide temperature range and is very easy to use. It's a must-have thermal leak detector for around the home, in the garage or on the job site. Measures surface temperatures from -58 to 999 degrees Fahrenheit, -50 to 550 degrees Celsius. 12:1 Distance to Spot Ratio. Built-in laser temperature gun sight for precise aiming No-slip grip designed to fit comfortably in hand Hold trigger and scan with the thermal heat detector's laser to determine the highest and lowest temperatures in the scanning area Backlit display with automatic shut off. Powered by one 9-volt battery (included) FDA Safety Certified.