No. of Recommendations: 2

One might note that plug in indicators for 3 prong outlets are available for a few dollars at your local Home Depot. They check easily for proper wiring including proper grounding and for reversed white/black, silver/gold.

There's a lot of grounding problems that those testers simply cannot detect. For example, if there's no ground wire at all coming up to the outlet, and the installer simply connected both the neutral side of the outlet and the ground connection of the outlet to the white wire (neutral), those testers will say everything is fine. And that's just one example.

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