Three-prong adaptor
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A cheater plug, AC ground lifter or three-prong/two-prong adapter is an adapter that allows a NEMA 5-15P grounding-type plug to connect to a NEMA 1-15R non-grounding receptacle. They are needed to all
A cheater plug, with metal grounding tab (lower right). The ground tab is designed to be attached to the outlet faceplate screw, which is supposed to be connected to the building electrical ground.
Electrical outlet tester
Videos
An electrical outlet tester, receptacle tester, or socket tester is a small device containing a 3-prong power plug and three indicator lights, used for quickly detecting some types of incorrectly-wire
A receptacle tester for North American wiring
A receptacle tester for European wiring
GFCI tester operating in European socket
A receptacle tester being used to check for some types of improper wiring of an outlet. For this particular tester, proper wiring is indicated by the two yellow lights.