1.Great for checking notes, credit cards, fluorescent inks (invisible inks), cracked glassware, or even crime scene. Strong in UV, but not strong in visible light. 2.UV flashlight is used to detect whether there everyday items containing fluorescent agent, particularly cleaning products, cosmetics, toilet paper, sanitary napkins or diapers, etc 3.The body of this flashlight is built of high quality aluminum alloy, and it has a very solid construction. 4.Excellent waterproof, suitable for outdoor environment, adverse weather conditions. 5.With hand strap, easy to carry.