The REED R5500-KIT bundles four tools for diagnosing household and light-commercial wiring: an R5500 circuit-breaker finder, an R5300 continuity tester, an R5110 non-contact voltage detector with built-in flashlight, and a soft carrying case to keep them together. The breaker finder plugs into an outlet and is scanned across the panel, using adjustable sensitivity plus audible and LED signals to pinpoint the correct breaker, and it can also flag common 3-wire receptacle wiring faults including a GFCI check. It's built as a grab-and-go set for electricians and maintenance techs who need multiple basic checks in one case.