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anoop t s
Jul 19, 2009, 03:07 AM
I want to know about the basic principle of operation of an electric tester pen?

tkrussell
Jul 19, 2009, 04:34 AM
This should help you:

What Do You Know About Capacitive Voltage Sensors? (http://ecmweb.com/mag/electric_know_capacitive_voltage/)

Newton1Law
Jul 20, 2009, 06:27 AM
Consider the following:

Electrical tester pen - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Electrical_tester_pen)