The Dri-Mark Smart Money Counterfeit Bill Detector Pen (model DRI3513B1) is a highly effective and inexpensive tool for detecting counterfeit U.S. currency. This pack includes three pens, allowing you to place them at multiple registers or keep extras on hand.

To use, simply make a small mark on U.S. paper currency. The chemically sensitive ink reacts instantly: an amber mark indicates the bill passes, while a dark brown or black mark indicates the bill is likely counterfeit. The pens are compatible with all U.S. currency issued from series 1959 and later, covering all modern bill designs.

Each pen is rated for up to 25,000 marks when properly capped and stored at room temperature. The pens are made in the USA and are ideal for retail businesses such as restaurants, markets, bakeries, and coffee shops that handle cash transactions regularly.