What can we say? They measure stuff.
The RT500 receptacle tester is designed to detect the most common wiring problems in standard 120 Volt receptacles. You can test your receptacles for correct wiring, open ground, hot and ground reversed, open hot, open neutral and reverse polarity. Conditions NOT indicated: quality of ground, multiple hot wires and combinations of defects, reversal of grounded and grounding conductors.
Klein Tools Receptacle Tester
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