Is there an Non-Contact Voltage Tester Pen that can accurately display the current and voltage, which will reduce a lot of electric shock accidents
The digital display test pen can simply measure several grades of display voltage: 12V, 36V, 55V, 110V, 220V. Digital display test pen is a kind of test pen, belonging to electrical and electronic tools, used to test whether the wire is live. The digital display pen body has an LED display, which can read the test voltage numbers intuitively. When measuring the live wire, the lighting circuit, the voltage U=220V between the live wire and the ground, the resistance of the human body is generally small, usually only a few hundred to several thousand ohms, and the resistance inside the test pen is usually about several megohms. The current (that is, the current passing through the human body) is very small, usually less than 1 mA. When such a small current passes through the human body, there is no harm to people, and when such a small current passes through the neon bulb of the test pen, the neon bulb will emit light. .
