1. Neutral line identification: the green light is always on
2. FireWire identification: the traffic lights are highlighted at the same time
3. Sensitive touch pole: when the tip of the pen touches the line, measure 4. Put your hand on the touch pole
5. Stretch spring: good elasticity, precise carton up and down the metal
6. Button battery: put in 3 pieces of LR41 button battery
7. Resistor chip: intelligent circuit board, sensitive and stable
8. Slotted batch head: alloy steel material, strong and durable
9. Smart chip motherboard, high safety performance, longer life
10. Eye-catching bright LED lamp beads, durable
11. Dimensions: 140x20mm