The unilateral temperature measurement accuracy of Linshang LS300 thermal insulation film temperature 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 thermal insulation rate measurement accuracy is ± 2% (colorless uniform light-transmitting substance), and the size of the test Glass sheet (not included) is 200mm × 160mm.