Invisible Ink Demonstration and Property protection kit. Pen makes a permanent invisible mark that can be used to trace an item such as a computer, calculator... Police departments use UV fluorescent lights and can see these marks to help get your property back to you. Kit includes a Permanent Invisible ink pen that goes on invisible but glows daytime bright under black light and a black light in a bullet shaped aluminum case with two sets of batteries. Mark valuables from your car to your classroom with your state and drivers license number to make your property quickly and easily recognized by law enforcement. Batteries included. Protect your valuables for the future. Information on how to place your order by fax or by telephone. Product Number UVIDKIT7