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Counterfeit Money Detection System, UV Light; Watermark Detector; Color Change Ink, U.S. Currency, 0.8 x 0.8 x 6, Black/Green

Quick Overview

Ultraviolet penlight reveals UV-sensitive security markings on 1996 series or newer U.S. currency of greater than $1 denomination.
Simply mark a line on a bill; if the mark turns dark, the bill is suspect.
UV light also works on many foreign currencies, major credit cards, passports, travelers checks and more.