DRI 351UVB The Dri Mark Counterfeit Dual Detector Pen (DRI 351UVB) offers a two-in-one solution for authenticating U.S. currency. This device integrates a UV LED light with a traditional detector pen, designed to identify counterfeit bills. The UV light function reveals the security thread present in U.S. denominations of $5 and higher, while the pen component verifies the authenticity of the currency paper itself. This dual detection method helps identify various forms of counterfeit currency, including b

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