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how to determine what a particular breaker turns off

last year

We bought a new (large) house and there are some circuit breakers that I can't figure out what they do. I've done the normal thing of turning off the breaker and going around checking lights and receptacles. What I would like is a tool that puts a signal onto that circuit and I would go around with a receiver and it would beep whenever I put the receiver close to a wall that contained that circuit. So I would follow the beeping until I find the output/termination of that circuit. Is there such a tool? I would want it to detect the circuit through a wall and over a distance of a foot or two (not just within a fraction of an inch). Could someone post some links?

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