Fluke BK120 SmartTrace Breaker Finder & Socket Tester

The BK120 has two parts. The transmitter plugs into an outlet on the circuit you want, and the handheld receiver, run along the panel, beeps and lights at the matching breaker. The transmitter also runs a one-button GFCI test and a simple wiring check with red and green lights, and the receiver doubles as a non-contact voltage detector from 90 to 240 V. The receiver runs on two AAA batteries, which are included.

It suits anyone about to replace an outlet, fixture or switch in a house with an unlabeled panel. Fluke also sells it in kits with a 107 multimeter or a T5-600 tester if you need to take readings as well.

Worth knowing The transmitter is rated for 110 to 125 V, so it traces ordinary household circuits, not 240 V lines. Fluke's page doesn't list which wiring faults the light check tells apart, so it is no substitute for a full outlet analyzer.