DTEK Counterfeit Detector Pens, U.S. Currency, 12/Pack

Quick Overview

Quick and simple way to detect counterfeit bills.
Ink changes color depending on the authenticity of the currency. Amber indicates legitimacy, while black or brown identifies it is counterfeit.
Good on all U.S. currency 1959 and after.
Antimicrobial protected, prevents the growth of odor-causing bacteria and fungus on the surface of the pen.