I got this device to see which outlets in my house are grounded and is a GFCI outlet. It is simple to use as the color code is written on the device. You simply plug in the device and the colors will light up immediately. It will only work on outlets with 3 prongs.My only con with this is the packaging. It comes in those really hard to open clam shell packaging. You still need a scissor or knife to open this.
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