The Royal Sovereign RCD-1500 Ultraviolet Counterfeit Detector provides a compact and portable counterfeit detection solution for businesses and organizations in the constant fight against fake bills and IDs. The UV rays easily detect fake bills and ID cards by revealing fluorescent strips, dots, and other markings that are invisible to the naked eye. Unit also comes with a UV detection guide for 20, 50, and 100 dollar bills that will show what markings to look for in authentic bills. Easy-to-Use Design When presented with a questionable bill or ID, simply place bill or document on the detection place and turn on the UV light. Check for either the glowing security threads and/or holographic images on IDs to prove the bill or ID authenticity. It''s compact design allows it to fit in tight spaces and to be carried on the go. Ultraviolet Light Detection Authentic US bill comes with a security thread that will glow a certain color when placed under the UV bulb. The UV detection guide that is located on the top of the unit will show you what color the strip will glow depending on the bill denomination. US Security Chart Guide All Royal Sovereign counterfeit detectors come equipped with a US security chart guide. This guide will help you determine if a US bill is authentic or counterfeit by diagramming the location of the markings present on all genuinely minted US bills.