Today we are talking about testing electrical devices like switches, outlets, extension cords, etc... without actually having to touch any live parts. this avoids the danger of getting shocked...or at least lessens it. I'm taking about a non-contact voltage tester. this handy little device clamps right to your shirt pocket and is ready for use whenever you need it. With this little gadget, you can see if the power is on or off. check for breaks in an extension cord, and safely check the status of outlets and switches without worrying about shorting out anything with tester leads, like you might when using a regular voltage tester or multimeter. Let's look at some of its unique testing abilities.
...Source: http://electrical.about.com/b/2013/06/04/testing-without-touching-electricity.htm
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