6. Identify the live wire: the live wire indicator is on, the zero wire indicator is off 7. Strong adsorption to improve efficiency The strong magnetic design of the can adsorb screws and small metal parts to improve work efficiency Item model number: B04 Product Name: Electrician Test Pen Measuring range: zero fire wire identification Product process: Neon bulb Applications: It can be used in electronic factories, electrical appliances, automobile maintenance, households, etc., and has a wide range of uses. color:Grey Material:Metal Package Contents: 4 x Voltage Tester Pen Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 2. Long-life neon bulbs, high-brightness work, worry-free, , and stable brightness 1. The clip design is easy to use and easy to carry 5. Ergonomic design, practical and convenient without installing batteries 4. Chrome vanadium steel magnetic bit material 3. Humanized design of anti-slip handle, feel comfortable