Check temperature of engine, muffler, brakes and moreCheck temperature of tires and brakesCheck for leaks around windows and doorsCheck temperature of heater vents or air conditionerMeasures surface temperature without making contactLaser pointer for accurate useEasy to read large digital displayTemperature range: -20 to 520CAccuracy::+-2C (+-3F) or 2% readingAmbient operating range: 32 to 105FRepeatability: 2% or 3FResponse time: 500m/sec, 95%Spectral response :7-18 umRelative humidity: 10-95% Rh noncondensing@up to 86FEmissivity:0.95Weight: .33 lb (without battery)Dimensions: 6.3 x 3.54 x1.7 inchesPower source: 9V batteryDistance to spot: 8:1