Tacklife Outlet Tester | $6 | Amazon | Promo code ZWKISHFH
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Before you do any electrical work around the house, you might want to pick up this outlet tester for $6 with code ZWKISHFH. A series of three lights corresponds to a chart printed right on the device, telling you if the outlet is properly grounded, has reversed polarity, and more. It’s not fancy, but it’s cheap, and could save you from a nasty surprise.