Q-Connect Counterfeit Detector Pen. 96% accurate on bank notes of all denominations. Fraud causes losses to many different types of business and anything that you can do to avoid fraud can help to save you money. This counterfeit detection pen helps you to identify forged bank notes with 96% accuracy across all denominations. Using the pen is as simple as writing on the note and watching for a change of colour. This simple action could help to save you lots of money and help to stop unsavoury characters getting away with crime.