It is a common secret that the market is full of fake USA dollars. This kit will help you to distinguish the forged notes from the real ones by detecting the only feature that is impossible to copy: The special magnetic ink which is used to print some parts of the note. The production of this ink is strictly controlled and it is impossible for forgers to get hold of it. Very useful for change bureaus, tourist businesses and shops. Supply voltage: 9VDC. Suitable box: 2101