Please note, this item ships from an international seller. Expected delivery is 10-15 days. Specifications: Color:blue&yellow Quantity:10 pcs Length:13cm/6.89 inFeatures: 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 whereas if it touches paper a stain will instantly appear. When written on a real bill, the color of the handwriting is pale yellow or colorless and transparent. When written on counterfeit banknotes, the color of handwriting is brown or black. Pen mark shows if the note is suspect, it doesn't if the note is genuine.Package including: 10 x Money Tester Note: The measurement allowed error is +/- 1-3cm. Color may slightly different due to the color calibration of your monitor. The Money Marker counterfeit marker is specially formulated to deliver accurate and easy results within seconds. Expose a fake with a fake bill pen and a counterfeit pen pay for itself Mark paper currency: light or clear mark, the currency is genuine. A specially formulated solution delivers results in seconds. Dark mark appears the currency is suspect or nongenuine This counterfeit bill detector Does not damage legitimate bills, The Counterfeit Money Marker is the simplest solution to instantly identify counterfeit bills Avoid profit loss with this Counterfeit Bill Detector Kit that's perfect for convenience stores, small businesses, garage sales, office desk accessories, farmers' markets, retail stores, kiosk security tools, or any other environment where you need to detect real money Package including:10 x Banknote detector Pens