Klein Tools RT210 Outlet Tester, Receptacle Tester for GFCI / Standard North American AC Electrical Outlets, Detects…

Amazon.com Price: $9.97 (as of 25/11/2020 05:10 PST- Details)

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Detects the most common wiring problems in standard and GFCI receptacles
Works on GFI outlets and confirms operation of the ground fault protective device