The Dri Mark Tri-Test Counterfeit Detector provides essential protection against counterfeit currency and falsified documents. This compact and portable unit features triple protection with advanced ultraviolet LEDs for detecting embedded security markings, white LEDs for revealing watermarks, and a reliable Smart Money Counterfeit Detector Pen for testing genuine currency paper. Ideal for authenticating various documents such as drivers' licenses, passports, and credit cards. The long-life LED unit operates on three AAA batteries, which are sold separately.