Fuel Dispenser Anti-Skimming Input Device

Methods of detecting fraud at card reader input devices. One method includes providing a sensor circuit comprising a sensor coil, wherein the sensor coil is coupled with an exterior surface of a card reader input device housing, and applying alternating electric current to the sensor circuit. The method also comprises measuring an electrical characteristic of the sensor circuit to obtain at least one measured value of the electrical characteristic and storing in a card reader input device memory at least one reference value of the electrical characteristic. Finally, the method comprises comparing, via a card reader input device processor, the at least one measured value with the at least one reference value to determine whether a skimming device is disposed internal to the card reader input device housing proximate to the smart card contact block.