Electrical tester pen

Electrical tester pen

An electrical tester pen or test pen is a device for quickly checking whether a conductor is live. The device may have the form of a screwdriver. The tip of the device is touched to the conductor being tested (for instance, it can be used on a wire in a switch or inserted into a hole of an electric socket). The user must touch the top of the handle (which is metallic, unlike the rest of the handle), at which point the indicator (LED or neon lamp) will light up if the conductor being tested is live.

The user's body serves as a capacitor to ground, and the current which flows in and out of the person is usually too small to be felt.

External reference

[http://www.louyeh.com/how-to-use-a-test-pen-to-test-for-electricity-supply/]


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