Description
1.Place the testing card 3.5 inches away from the heating lamp and wait for 10 seconds, which can quickly test if there is an ultraviolet ray. 2. It can also be used to test whether your other UVB products are good or not. 3.Can be used up to 500 times ,compatible with sunglass test & sterilizing. 4.When not in use, suggest to put it in a card sleeve or store it in a dark place. 6.The best details：Outside is black environmental protection coating ,ensure that the surface has always been beautifu
