The Klein Tools RT210 GFCI Receptacle Tester plugs directly into any standard North American outlet to instantly verify proper GFCI protection, correct polarity, and wiring continuity across hot, neutral, and ground wires. It illuminates grounded outlets, identifies which position of duplex outlets is fed first, and quickly reveals common wiring errors without the need for additional tools.
Designed for electricians, contractors, and homeowners alike, the RT210 also tests for overheating conditions and opens GFCI-protected receptacles, making it an essential diagnostic tool for locating wiring faults in residential and commercial installations.