The Dri Mark Smart Money Counterfeit Detector Pen (model DRI351R1) is a fast, reliable tool for detecting counterfeit U.S. currency. Simply draw a small mark on any U.S. bill: the pen's iodine-based ink reacts with the starch in counterfeit paper to produce a dark brown or black mark, while genuine currency's starch-free paper yields a light yellow or amber mark, indicating authenticity. Each pen is compact and portable, making it easy to keep at any cash register or point-of-sale station.

This pack contains 12 individual detector pens, providing enough supply for multiple registers or extended use. Dri Mark is a U.S.-based manufacturer with over 60 years of experience producing specialty markers and detection tools. The DRI351R1 is widely used in retail, banking, food service, and other cash-handling environments as a simple first-line defense against counterfeit bills.