Klein Tools’ RT250 GFCI receptacle tester has a large, LCD readout of voltage and clear indication of wiring conditions. It detects and identifies common wiring faults and has auto-hold for hard-to-reach outlets. Green and red LEDs illuminate for visual indicators. It has a 6.6-ft. drop protection.

Southwire Tool and Equipment’s 40012S receptacle tester identifies the most common wiring faults associated with 120V outlets. Plug it in, and the indicator lights tell users if the outlet is wired correctly. It performs six tests: open ground, open neutral, open hot, hot/ground reversed, hot/neutral reversed or wired correctly.