Running a cash-based business? Protect yourself from fake bills with this Dri-Mark Tri-Test Counterfeit Bill Detector. It's a simple, all-in-one tool that gives you three ways to check money. First, it has a UV (ultraviolet) light to reveal the hidden security threads and markings that real US bills have. Second, it includes a special ink pen – you mark the bill, and if the mark turns dark, it might be counterfeit (real currency paper reacts differently). The unit itself is compact, about 7 x 4 x 2.5 inches, so it fits easily on any counter or desk. Model number is 351TRI. It's brand new in its packaging. Perfect for retail stores, restaurants, bars, flea markets, or any place that handles cash. Gives you and your staff confidence and helps prevent losses. A must-have for basic cash security. Easy to use, no training needed. Check those big bills quickly and reliably!