Counterfeit detection pen compatible with most world currencies, including EUR, USD, GBP, etc. Simply mark the ticket to be checked. If the mark is displayed in black, the bill is counterfeit. If the mark is not visible when passing the marker, the note is correct. System of easy and fast use, which will prevent the entry of counterfeit bills. specs Special pen for detecting counterfeit bills. Compatible with most of the world's banknotes, including Euro (EUR), British Pound (GBP) or United States Dollar (USD). When marking a genuine banknote, the trace is displayed in bright yellow. If the bill is counterfeit, the trace is shown in dark color. The marks on the bill disappear after a few minutes, leaving no trace on the bill. Easy and fast use. Prevent counterfeit bills from entering your store, without investing in expensive electronic detection systems.