Drimark Counterfeit Detector Pen with UV Cap &ndash; Dual Test Dri Marks unique patented Dual Detector counterfeit pen and UV light is a super fast, reliable way to check for counterfeit currency and protect your business Perfect for detecting bleached bills. These are $1s and $5s that have had the ink removed and over-printed with a higher denomination to fool counterfeit pens. The UV light shows the security stripe which cannot be duplicated by counterfeiters Powerful UV light is embedded in the cap and is easy to activate. The LED bulb is specifically designed to reveal the hidden security stripe in all bills $5 and higher Pen detects genuine US currency paper. Simply draw a mark on a dollar bill: dark mark means counterfeit, light mark passes test 3 LR-44 button-cell batteries are included. Enough power to check thousands of bills Bonus pack contains 2 free counterfeit detector pens! Instruction booklet is included in all packs. Location and color of security stripes are shown, along with other helpful information Also great for authenticating passports, credit cards, travelers checks, and drivers licenses The only Counterfeit Detector Pen still made in the USA Patented design (U S Patents 8,406,499 and 8,545,766). Superior quality means superior performance and the best protection for your business