The electric pen shows 12v, which means that the voltage value of a certain area of the electrical appliance is 12 volts. Try not to use this kind of digital test electric pen. The numbers it displays are easy to mislead users.
Electric test pen is also called electric test pen, referred to as "electric pen". It is an electrician's tool used to test whether there is electricity in the wire. There is a neon bulb in the pen body. If the neon bulb glows during the test, it means that the wire has electricity or is the live wire of the passage. The nib and tail of the test pen are made of metal material, and the pen holder is made of insulating material. When using the test pen, be sure to touch the metal part of the end of the test pen with your hand, otherwise, because the charged body, the test pen, the human body and the earth do not form a circuit, the neon bubble in the test pen will not emit light, resulting in misjudgment, and it is considered that the charged body Not powered.
