The Dri-Mark Smart Money Counterfeit Bill Detector Pen is a highly effective and inexpensive tool for detecting bad bills and deterring counterfeiters. Simply make a small mark on U.S. currency and the chemically sensitive ink works instantly. An amber mark passes the test, while a dark brown or black mark means the bill is probably counterfeit. The Dri-Mark Smart Money Counterfeit Bill Detector Pen works on all new design U.S. currency (bills series 1959 and later). The pen-style is for extreme portability.
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