This counterfeit bill detector Does not damage legitimate bills,The Counterfeit Money Marker is the simplest solution to instantly identify counterfeit bills. Each counterfeit marker pen size is approx. 13 cm in length, 1 cm in diameter, proper size for your use, portable and easy to carry. When you mark the banknote, it will turn into other color. The ligth yellow or clear color means the banknote is real and the brown or black color means the banknote is fake. The counterfeit detector pen is the simplest solution to instantly identify counterfeit bills, convenient to use and check the results in seconds. Practical tool in daily life, help you to detector true and counterfeit money, can be applied to many occasions, such as stores, small businesses, farmers markets and retail stores, etc. : 1. Forged note pens have been aiding people involved in cash handling for years. This pen does the job of checking for fake notes instantly, by swiping a line across the note and checking for a dark line to appear. This works by not reacting with the cotton based note where as if it touches paper a stain will instantly appear. 2. When written on a real bill, the color of the handwriting is pale yellow or colorless and transparent. 3. When written on counterfeit banknotes, the color of handwriting is brown or black. Features: 1. 10 x Fake Note Checker Pens 2. Pen mark shows if note is suspect, doesnt if note is genuine 3. Ideal for the 20 note, the most forged note in the UK 4. Simple for staff to use 5. Does not work with polymer notes Package included: 10pc Fake Note Checker Pens