Extech ET10 GFCI Receptacle Tester

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Every home inspector should have one. It could be used for the Standards of Practice at Home Inspection Standards of Practice - InterNACHI®.

According to the InterNACHI® Home Inspection Standards of Practice, a home inspector is required to inspect all ground-fault circuit interrupter receptacles and circuit breakers observed and deemed to be GFCIs using a GFCI tester, where possible.

And here’s a big list of inspection tools Home Inspection Tools & Equipment List - InterNACHI®.