Product Description 2 IN 1 Detector Pen with UV light Counterfeit Bank Note Tester Pen with colorful pen Money Recognizing 1379 Model Product Feature 1.ink application a genuine note will remain clear, however, a Counterfeit Note will turn Black/Brown. 2.With a small UV light in the pen lid: Simply put the note under the UV light on a dark background, the value of the note will appear in bright red and green in a specific area 3.The mark will disappear within 24 hours so the note is not defaced. Product Specification Single item 20X20X20 cm Single gross weight 0.600 kg