Dri Mark Smart Money Counterfeit Bill Detector Pen - Chemical - Black - 1 Dozen Description: Counterfeit Money Detector Pens are ideal for use in busy retail environments. This quick inexpensive currency-screening device can be used in conjunction with other counterfeit detection methods. Mark a small line on U.S. currency. When mark is amber the bill is genuine. If mark is black or dark brown the bill is suspect. Features: Detector Pen 1 Dozen Color: Black Country of origin: US Brand Name: Dri Mark Model No: 2088-DRI351R1