A counterfeit detection apparatus is formed as a desktop currency detector which has a slim configuration and a small footprint on the order of about 175 mm×100 mm. The desktop counterfeit detector provides white light that can shine from below a currency bill that is placed on its translucent cover and also provides and overhead UV lamp which is situated approximately 30 mm above the translucent light table. The detector also provides a compartment for a counterfeit detector pen which contains a special ink formulation that can apply a color changing test mark to a currency bill to test its reaction with the paper to determine its genuineness. Thus, the detector provides a three-test opportunity to check the genuineness of a currency bill by white light, UV light and a specially formulated ink suitable for checking the paper stock.