Greenlee 2011 Power Finder Circuit Seeker is a tool for experienced electricians that can identify and trace either live or unenergized circuits. It can also locate faults or opens in a circuit, identify specific breakers and trace circuits shorted to ground. The Circuit Seeker consists of two primary components: a Receiver and a Transmitter. The transmitter is connected to the circuit being traced or identified and will contact line voltage if the circuit is energized.