Abstract: A coin testing apparatus for discriminating between acceptable and unacceptable coins has a ramp down which coins are constrained to roll. A first optical device is positioned in predetermined spaced relationship with the ramp to detect a first parameter of a coin rolling down the ramp to produce a first signal of predetermined timed duration for a coin having the proper first parameter. A second optical device is spaced in predetermined relationship with the first optical device to detect a second parameter of the coin and produce an output signal for a coin having the proper first and second parameters. The output signal energizes a device for detaining coins having an improper third parameter until expiration of the timed duration of the first signal, and a reject mechanism is operatively connected to reject any coins having an improper parameter.