Currency detector
![A typical US validator with a green bezel](/Images/godic/202501/05/Bill_Validator3448.JPG")
![An American banknote passing through the device. Note the pistons that grab it when it detects an insert.](/Images/godic/202501/05/Dollar_bill_passing_through_a_currency_detector3448.jpg")
![Tiny cameras are mounted on the motherboard](/Images/godic/202501/05/BVCircuit3448.JPG")
A currency detector or currency validator is a device that determines whether banknotes or coins are genuine or counterfeit. These devices are used in many automated machines found in retail kiosks, self checkout machines, gaming machines, transportation parking machines, automatic fare collection machines, and vending machines.