Money detector pen (ec1788) Money detector pen (ec1788) Product description ? There are millions of counterfeit bills in circulation. Why run the risk of accepting a bogus bill? our universal counterfeit detector pens use a specially formulated chemical that detects fake currency instantly. Simply press the tip of the pen to the bill-- if it turns yellow or clear the bill is good, if it turns black or brown the bill is suspicious. Instructions printed on the pen. Works on most currencies world-wide. More product features ? Trademark: ec Model: ec1788 Origin: china