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Feature

The original and best Counterfeit Detector Pen, patented by Dri Mark in 1991.
Superior chemical test for counterfeit US paper money.
A simple mark on paper currency: dark mark means counterfeit, light mark passes test
The only Counterfeit Detector Pen still made in the USA
Superior quality means superior performance

Description

The Dri Mark Counterfeit Detector Pen is your best first defense against loss due to counterfeit. An essential for any retail business accepting cash. Simply uncap the pen and make a small mark on US currency. If the mark turns dark brown or black, the currency is suspect. If the mark remains light yellow, the bill passes the test.