Buy the AMES Electrical Receptacle Tester with GFCI Diagnosis (Item 63929) for $3.99 with coupon code 39706180, valid through February 29, 2020. See the coupon for details.
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The Ames Electrical Receptacle Tester checks GFCI outlets for proper operation and checks for seven wiring conditions overall. Simply place tester in outlet. Press black “overload” button to test circuit interruption.