UV2000 UV Tester: Having this detector, put the color-changing lenses on the setting fiance and the Anti-UV optical lens cover over half of color-changing lenses to shelter from the light of LED Auto Interceptor, turn on the UV switch, it only spends 10 to 20 seconds to explain the color-exchanging procedure and Anti-UV opticallens detector function. Rank of measurement of A UV rays 315~400nm and B 280~315nm. Specifications: Dimensions: L273 x W162 x H112mm Power requeriments: 110V 60Hz /220V 50Hz AC 20W Weigth: 0.6Kgs.