RYOBI Power Tracer is the industry's first all-in-one residential circuit tester and tracer. It allows you to instantly diagnose an outlet's wiring, as well as trace a circuit breaker with the push of a button. It fits into standard 3-prong, GCFI, and AFCI outlets. Power Tracer has an onboard diagnostics chart and neon indicators that tell you if an outlet is wired correctly or not. But it doesn't stop there, it can also easily identify unlabeled or mislabeled breakers and trace outlets up to 100 ft. from the breaker box.