[When the ambient temperature changes suddenly, wait for 30 minutes, Make the instrument temperature consistent with the environment to obtain accurate measurement values.] Smart Auto-Alarm Function：Features with MAX mode and and high/low temp warning. The indication of temperature gun turns red when test temperature exceeds the high/low limited setting, which could easily detect if the set temperature is reached or exceeded; Support degrees celsius(-50℃ to 550℃) and fahrenheit (-58℉~1022℉) Non-Contact Measurement: PREXISO handheld infrared temperature gun keep you stand further from heat or other measuring items. Built in 12 laser pointers to accurately aim at, which can turn on/off the red dot freely base on works.The distance spot ratio is 12:1, which means you can measure the target in greater distances with non-contact to avoid the risk of contact, safe and reliable. Laser: Class 2, maximum laser output <1mW Extremely Accurate & Quickly Response: Digital laser thermometer only need less than 0.5s to accurately measure. Built for accuracy, our laser thermometer gun is made with an advanced temperature sensor technology with adjustable emissivity (0.1-1.0). Regarding the emissivity setting for different materials, you can refer to the user manual HD Colorful LCD Backlight Display: PREXISO handhled thermometer with clearer and bigger data display with backlight makes this IR laser thermometer gun outstanding, especially in the dark; Auto power-off and low battery indicator Versatile Use: PREXISO thermometer gun can be used both at home and in industrial settings. Whether you're measuring cooking, heating food, barbecue or other performing household tasks, home maintenance and repair, home cooling, car repair,automobile maintenance, HVAC real estate, fire-watch, electrical engineering, hot engine works, PREXISO infrared temperature gun does it all