The unilateral temperature measurement accuracy of Linshang LS301 thermal insulation film Tester is ± 0.5C °, the temperature unevenness of double lamps is 2C °, the temperature measuring range is -55C °~ + 125C °, the temperature test time is 1 minute, the infrared peak wavelength is 950nm, and the thermal insulation rate measurement accuracy is ± 2% (colorless uniform light-transmitting material).