GENIE Quicktester, 10 pieces Chemical analysis | For €, $, £, CHF | 10 pieces The compact GENIE Quicktester is the ideal companion in retail, catering, at weekly markets or in private use, to ensure that you do not receive counterfeit banknotes. The banknote testing pen uses the special chemical properties of the ink to instantly detect the authenticity of euro, US dollar, British pound and Swiss franc banknotes.