InstallerParts AC GFCI Outlet Circuit Tester - 3 Prong Ground Plug 120 V Receptacle Electrical Fault Detector Easy to use AC outlet tester 120 Volt Test any GFCI outlet, standard outlet, or extension cord Tests for 6 conditions: Open ground, Open neutral, Open hot, Hot/Ground reverse, Hot/Neutral reverse, and Correct Quickly identify which of the six wiring conditions is indicated by the integrated lights Lifetime Warranty