Best Seller at Amazon. Dry Stains, Bed Bug, Resin Curing, Scorpions Finder Find invisible stains: UV flashlight helps detect food stains and pet urine stains on rugs, carpets, and clothes that are otherwise invisible to the naked Eye. Versatile use: authenticate currency and official documents like drivers licenses or identify unwanted whitening agent in cosmetics; ‎Cure UV resin.