ZOYI GM320 Non Contact Laser Digital IR Infrared Thermometer -50~380 Degree Product Intruction This instrument is a professional hand-held non-contact infrared thermometer，Use simple, rigorous design, measurement accuracy，Wide temperature range and etc.. It has a laser sighting，LCD display with backlight，Over-temperature alarm，Adjustable emissivity and Automatic shutdown function. When you target the object detection window at the subject，then it will be able to quickly and accurately measure the temperature of it . The basic operating principle It will lunch a certain proporation of infrared radiation energy in accordance with its own high and low temperature of all objects above absolute zero temperature. Radiation energy by wavelength size and distribution and its surface temperature has a very close relationship. According to this principle，Objects can be measured accurately infrared emission energy，Thus arrive at the exact temperature of the measured object. Features ◆Using infrared temperature probe，high measurement precision, more stable performance； ◆Having a high temperature measurement（Threshold can be set）、Voice prompts； ◆Backlit liquid crystal (LED) digital display； ◆Fahrenheit, Celsius two modes； ◆Emissivity０.1～1.00 Adjustable； ◆Built-in laser sight； ◆Automatic shutdown（Save battery consumption）； ◆Compact size ,reasonable structure, convenient operation. Attention: Battery not included because the customs inspection