Versatile counterfeit detector is designed to authenticate bills quickly and easily. To check for counterfeits, simply swipe the bill, and the detector will beep if it is suspect. In addition to automatic swipe test (verification), suspect bills can be visually checked for security thread using the UV illumination. Built-in ultraviolet illumination can be used to verify many forms of identification quickly and easily, including checks, credit cards, driver's licenses and passports. Counterfeit detector also detects counterfeit bills in foreign currencies such as Euros, Pesos, and most other currencies. Exterior is made of sturdy plastic.