Title: Better to guess!
Review: I have this exact model in a yellow color. When I tested the unit on my panel it could not locate the circuit breaker. It kept indicating the wrong breaker. The adjustment did not help isolate the signal at all.The only way to use this thing is to start snapping off breakers until the "beeping" stops. Then you know that you have the right circuit shut off.As an electrician, I took a chance on this item. I can not recommend the Sperry circuit tester. I am also an electrical engineer. The engineer who designed this piece of junk should be ashamed.Sorry for the negative review, but it's the way it is.
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