试电笔也叫测电笔，简称“电笔”。是一种电工工具，用来测试电线中是否带电。笔体中有一氖泡，测试时如果氖泡发光，说明导线有电或为通路的火线。 试电笔中笔尖、笔尾、为金属材料制成，笔杆为绝缘材料制成。 使用试电笔时，一定要用手触及试电笔尾端的金属部分，否则，因带电体、试电笔、人体与大地没有形成回路，试电笔中的氖泡不会发光，造成误判，认为带电体不带电。
Stanley high-end digital display test pencil 12-220V
The test pencil is also called the test pencil, referred to as the “electric pen.” It is an electrical tool used to test whether the wires are energized. There is a bubble in the pen body. If the bubble glows during the test, it indicates that the wire has electricity or a fire wire for the passage. The tip of the pen and the tail of the test pen are made of metal material, and the pen holder is made of insulating material. When using the test pencil, be sure to touch the metal part at the end of the test pencil by hand. Otherwise, the charged body, the test pencil, the human body and the earth do not form a loop. The bubbles in the test pencil will not emit light, causing misjudgment. No electricity.
According to the level of the measured voltage:
High-voltage test pencil: used for 10kv and above projects, for the daily inspection of electricians;
Low-voltage test pencil: For the detection of charged body with line voltages of 500V and below.
Weak electric test pen: used for testing of electronic products, the general test voltage is 6v–24v. For the convenience of use, the tail of the electric pen often has a lead wire with a clip.
According to the contact method:
Contact type test pen: A test tool that obtains an electrical signal by contacting a charged body. Usually the shape has a screwdriver type, and it is used for the test pencil and the flat-blade screwdriver; the pen type displays the measurement data directly in the LCD window.
Inductive test pencil: Inductive test, no physical contact, check the voltage on the control line, conductor and socket or check the open position along the wire. The personal safety of the inspectors can be greatly guaranteed.