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.
Dri Mark Products Inc DRI 3513B Dri Mark Counterfeit Detector Pens - Black - 3 / Pack