![]() A chart sticker on the tester helps you interpret the light patterns. Plug-in circuit analyzers have three neon lights that light up in different patterns to indicate specific test results. They can't be used on older two-slot outlets. These devices are designed to test grounded outlets that have three slots. Plug-in circuit analyzers are inexpensive, easy-to-use testers that can tell you a great deal about the functions of a circuit when you plug them into an electrical outlet. More sophisticated (and more expensive) types provide a rudimentary measurement of how much voltage is present, though the measurement is not nearly as precise as that offered by certain other electrical testers. The most basic models indicate only whether any voltage is present. Most models inform you of the voltage present with a red light at the tip of the tester as well as a buzzing sound. You can get a reading simply by sticking the tip of the tester into an outlet slot or even touching the outside of a wire or electrical cable. The device is like a mini wand with a small tip on the end that senses voltage in such things as electrical wiring, outlets, circuit breakers, lamp cords, light sockets, and switches. They are safe, easy to use, and inexpensive. Non-contact voltage testers (also known as inductance testers) allow you to check for voltage in wires or devices without you having to touch any electrical parts. Best for: Detecting and measuring voltage.The Spruce Home Improvement Review Board.
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