Receptacle testers are used to test wiring in electrical receptacles. They identify outlets that are open ground, open hot or open neutral; hot, hot on neutral, or ground reversed with open hot; and ...

Grab a friend, a radio or a receptacle tester. Position a friend in the room with the tester, or plug in the radio and turn ...

The concept of an outlet tester is pretty simple: plug the gadget into a suspect wall receptacle, and an array of LEDs light up in various patterns to alert the user to any wiring faults.