An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called blackbody radiation emitted by the object being measured. They are sometimes called laser thermometers if a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device's ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and its emissivity, the object's temperature can often be determined. Infrared thermometers are a subset of devices known as "thermal radiation thermometers.Display Min,Max or avg temp, Hi & lo alarms for rapid display for measurements, Precise laser technology for accurate measurements, Large easy to read backlit LCD display, IP40 rated for extra protection ,DISTANCE TO SPOT RATIO (D:S) 8:1.Battery:1 AA IEC LR06.Vibration and Shock: IEC 68-2-6 2.5 g, 10 to 200 Hz, IEC 68-2-27, 50 g, 11 ms.Response Time (95 %) :<500 ms (95 % of reading).