Well I used this when traveling in Vietnam as they have a lot of fake money floating around waiting for tourists to become victims of the scam. Well this light let me see if the money was fake or not when exchanging cash. The real thing has UV marks all over it so this light makes checking easy and quick.
Great little product.
This Mini UV Light LED Flashlight Keychain is great for the price. It doesn't give off a bright light but it is good enough for checking things like the watermarks on money or dirt & mold. works great for the money.