Check the status of and troubleshoot 3-wire circuits and GFCI receptacles. REED R5210 Offers This outlet tester quickly identifies faulty wiring. Plug the instrument into the receptacle under test and match the light pattern to the indicator chart to determine the fault. The R5210 features a built-in GFCI test to quickly verify GFCI outlets are functioning properly. Features Compact design Detects most common 3-wire receptacle issues LED indicators identify 5 wiring faults Status indicator chart GFCI trip test Included REED R5210 Receptacle Tester with GFCI