We discuss a product inspection apparatus, comprising a drive motor configured to drive a conveyor and a metal detector for detecting a contaminated product at a first location on the conveyor an inverter configured to receive an AC power supply of less than 150V and control a rotation speed of the drive motor, and a reject mechanism control system configured to receive, from the metal detector, an indication that the contaminated product has been detected at the first location, receive, from the inverter, a pulse train output indicative of the rotation speed of the drive motor, and identify the contaminated product at a second location on the conveyor in dependence on the indication of the contaminated product and the pulse train output.

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