A system verifying an item in a package comprises a package producer and a verifier. One system includes a control unit configured to determine a temperature ratio, the temperature ratio including a relationship between a change of internal temperature of the object from an initial temperature to a temperature measured at an elapsed time and the total internal temperature change needed to reach a reference temperature. The asynchronous machine includes a rotor configured to be driven in rotation by the engine and a stator connected to the electrical equipment.