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What Is Digital Pencil

Digital pencil is a kind of Tape, which belongs to electrical and electronic tools, and is used to test electric wires. Digital display pencil handwriting with LCD screen, you can visually read the test voltage number. When measuring the line of fire, the lighting circuit, the line of fire and the ground between the voltage u=220v around, the human body resistance is generally very small, usually only hundreds of to thousands of ohms, and the resistance inside the pencil is usually about a few trillion Euclidean, through the pencil of the current (that is, through the human body of the current) is very small, usually less than 1 MA, such a small current through the body, There is no harm to people, and when such a small current passes through the pencil neon, the neon light glows.                                

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