Specification of Non contact Infrared Thermometer Temperature Range: -50C ~ 550C (-58 F ~ 1022F) -50C ~ 750C (-58 F ~ 1382F) -50C ~ 1100C (-58 F ~ 2012F) -50C ~ 1300C (-58 F ~ 2372F) -50C ~ 1600C (-58 F ~ 2912F) Accuracy: 2% or 2C Distance Spot Ratio: 12:1 (only 550 C) / 50:1 Emiivity Adjustable: 0.1 - 1.0 Response Time Wavelength: 500ms & (8-14) um Repeatability: 1% or 1C Resolution: 0.1 C or 0.1 F Storage ambient temperature: -20-50 C (-4-122 F) Operating temperature: 0-50 C (32-122 F) High/low temperature alarm setting:Yes Measuring maximum/minimum/average/difference:Yes Fahrenheit / Celsius conversion:Yes Measurement data storage function:Yes Power percentage display function:Yes Laser target display selection function: dual laser Backlight display selection function:Yes Automatic shutdown function:Yes Low display function:Yes Power supply: 9V battery(Not included) This product is not suitable for measuring temperature of body surface,Forehead,Baby ! (Function Diagram) 1.LCD 2.Backlight laser// button 3.Mode selection 4.Up/down button 5.Battery cover 6.Measure key 7.Laser hole 8.Infrared lens (LCD Display) .Data hold .Laser sign .Data recall .The percentage of remaining battery power .Current temperature reading .Setting display .High temp alarm .Low temp alarm .MAX measure .MIN measure .Average measure .Difference measure .Emiivity