Amazon.com : Dri Mark Counterfeit Bill Detector Marker Pen, Made in The USA, 3 Times More Ink, Pocket Size, Fake Money Checker - Money Loss Prevention Tester & Fraud Protection for U.S.
Amazon.com : Money Marker (5 Counterfeit Pens) - Counterfeit Bill Detector Pen with Upgraded Chisel Tip - Detect Fake Counterfit Bills, Universal False Currency Pen Detector Pack : Office Products