Abstract: A contact pin extends into a removable metallic coin collecting container at a predetermined fill level and is connected to one end of the secondary winding of a transformer forming the tank circuit of a first oscillator which has an output signal circuit on the output thereof. The other end of the secondary winding is connected to the metallic coin container or to another contact pin spaced from the first contact pin a greater distance than the diameter of the coins being collected. When coins in the coin container reach the predetermined fill level they complete the contact pin circuit causing the output signal circuit to emit a signal indicative that the coin container is full. The wall of the removable coin container, when it is in place, extends through the field of an induction coil connected in the tank circuit of a second oscillator which has a second output signal circuit on the output thereof to emit a signal indicative of whether or not the coin container is in place.