Explanation from Baidu Know "How many volts is the voltage range measured by a low-voltage test pen":
Pressure measuring pen: used for charged body detection of line voltage 500V and below.
The test pen is also called a test pen, or "electric pen" for short. 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 of the test pen. 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 a misjudgment, and it is considered that it is charged. The body is not charged.
