Morris 59090 GFCI Receptacle Tester GFCI & Receptacle Tester - GFCI & Receptacle Tester for electrical work. GFCI & Receptacle Tester Instantly Displays Wiring Condition of Any Standard 3-Wire AC 110-120 Outlet or Ground Fault Circuit Interruptor Trips GFCI Receptacle to Indicate Operational status Neon Indicators Give Positive Indication of Current Status Compact Unit Simply Plugs into any Standard 3 Wire/Grounded Receptacle (110125 Volt AC Circuits)