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A simple 3 prong plug in device with 3 leds. The leds indicate the polarity status. A fast method of determining the polarity of a wall plug. Had a Sears, now use a Harbor Freight brand. It is called a outlet circuit tester model GFCI.
A simple 3 prong plug in device with 3 leds. The leds indicate the polarity status. A fast method of determining the polarity of a wall plug. Had a Sears, now use a Harbor Freight brand. It is called a outlet circuit tester model GFCI.