The Milwaukee GFCI Receptable Tester is designed to reduce the risk of electrical shock generated from outlets. The over molded grip provides durability and comfort for all applications. Additionally, the visual indicator light turns on indicating the activation of the GFCI test, if functionally correctly. LED visual indicators help determine the wiring conditions of an electrical outlet. Wiring conditions indicated: hot & ground reversed, hot & neutral reversed, open hot, open neutral, open ground, and correct wiring. The Milwaukee Circuit Breaker Finder Accessory Kit can be used with Milwaukee Circuit Breaker Finder w/ LED as well all other Circuit Breaker Finders. The alligator clip adapter is used for locating the correct breaker of hot and neutral bare wires, and the light socket adapter enables you to locate the correct breaker of a light bulb socket. The Circuit Breaker Finder Accessory Kit also comes with a 3-Prong to 2-Prong grounding adapter.