2 in 1 Invisible Ink Pen with UV black light

Write secret messages
Counterfeit money detector (by revealing water marks)
Built in Flashlight You can write invisible messages or design on paper or skin, only read by UV LED light. Great for dorm room decoration, safety property markings, dance clubs and etc. The best choice as gift for promoting goods and advertisement Write secret messages Counterfeit money detector (by revealing water marks) Built in Flashlight Power: 3 * AG-10 Batteries Length: 5.12 " Height: 0.79 " More »