3-in-1 tester locates breakers, tests receptacles and GFCI circuits. REED R5500 Offers This circuit breaker finder quickly and easily identifies the correct circuit breaker protecting a specific electrical circuit. The R5500 also features a receptacle tester to identify faulty wiring and a GFCI check button. Features Simply plug the transmitter into a receptacle and scan breaker box to identify the circuit Detects 5 3-wire receptacle wiring faults Built-in GFCI receptacle check function Adjustable sensitivity wheel quickly identifies breaker Audible (buzzer) and visual (LED) indicators assist in identification Included Receiver Transmitter Battery