The Accurate & Durable Outlet Tester from GroundLuxe is an essential tool for owners of grounding products. This outlet tester allows users to quickly assess receptacle safety risks in the home, accurately checking that outlets are properly grounded and free of hidden power faults. This ground tester provides reliable measurement for 120V 3-prong US outlets with easy-to-read outlet checker indicators to show you exactly what's happening. Just plug it in to easily detect outlet wiring problems fast, with alerts to several common mis-wiring issues. UL-certified outlet tester that is appropriate for testing outlets before using any grounding product., Manufacturer: GroundLuxe