With the transmitter plugged into an AC outlet go to the circuit breaker panel and open the cover. Then turn on the receiver and place the target on the tip firmly against the first circuit breaker in the panel. Press and hold the calibration switch while moving the receiver across the circuit breakers.
Sperry Circuit Breaker Finder, Model# CS550A

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- Designed for 120V AC, 50 to 60Hz
- Includes transmitter and receiver
- Audible alert and bright LED visual indication
- Requires no service interruption
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