Counterfeit detection system offers two simple tests for counterfeit U.S. currency when you need extra security. Use the powerful ultra violet light to check for the UV sensitive strip found in notes printed 1996 & later. Use the Counterfeit Detector Pen to check for authentic U.S. currency paper. UV light is also perfect for authentication of credit cards, personal & travelers check, passports & more. Includes UV pen, light & batteries.