Dri Mark is the original patent holder and only domestic manufacturer of counterfeit detector pens. For over 20 years, the Dri Mark Counterfeit Detector Pen has been the best selling, and most successful counterfeit detection product in the industry, with an 80% market share. Security products include: The Original Counterfeit Detector Pen, our patented Dual Test™ and Tri-Test™ Counterfeit Detector Systems, counterfeit training guides and UV Pro Light. Contact taffey@drimark.com for detailed information on our complete collection of counterfeit detection systems.