The Dynatel 573A is a portable, battery-powered tone set that detects and pinpoints sheath and conductor faults, and locates the path of buried or underground (UG) cables. It will indicate the presence of dangerous voltage on a test section and detect RF (Radio Frequency) and audio frequencies applied to a conductor by its transmitter. 60 Hz AC current is detected with the receiver alone, and sections of substantial AC power influence can be located with the receiver and earth frame.