Description : Temperature range: -50C~330C (-58~626F); Accuracy: +/-1.5C (+/-2.7F) or 1.5% during 0C~330C (32F~626F), +/-3C (+/-5F) during -50C~0C (-58F~32F); Repeatability: 1% or 1C; Response time: 500mSec, 95% relative; Response wavelength: 8~14um; Emissivity: 0.95 pre-set; Working temperature: 0C~40C (32~104F); Relative humidity: 10%~90% RH non-condensing; Storage temperature: -20C~60C (-4F~140F); Powered by 2 x AAA batteries (included); Battery life: Laser off 12 hours; Object distance ratio: 12:1 How to Use : BENETECH GM320 1.2 ,Tester Thermometer with 1,2" LCD Display. temps seem to be accurate, easy to read numbers. Futuristic tools, thermometer work great and accurate.This tool tester for most work.