A circuit tracer kit consists of a transmitter, receiver and probe. The transmitter has a connection to one end of the circuit (electrical outlet) and transmits a signal that will travel along the wire that it is connected to. The receiver’s job is to detect the signal being transmitted on the circuit. The receiver is usually a handheld unit that can be adjusted to pick up different signals. When the receiver goes near a wire carrying a signal the user will be alerted with a noise or flashing light. The circuit tracer will also contain a probe that contains three different sensors. An electric field sensor in the probe, detects the end of the conductor, the differential field sensor decides the direction of the conductor above ground and the inductive sensor determines the direction of the conductor transmitting the circuit underneath the ground. The probe’s job is also to generate electrical energy (via a switch) which then determines the volume of power generated by the signal on the circuit.