【Wire Identification】Put your hand on the cap and touch the pole, insert the voltage measuring pen into the air, the electric pen lights up with double-color red and green lights, it is the live wire, lights up the green light for the zero line 【Electric Pen Battery Self-Inspection】After the battery is installed in the screwdriver electric pen, self-inspection is required. If the green light is on, the battery is fully charged, and the battery is low if the light is off or weak. 【Good-Quality Material】High-hardness chrome-vanadium steel material has good conductivity, the main board professionally upgrades the chip control program, higher security, and longer life 【Humanized Design】The test pen is small and portable, the clip design is convenient for electricians to carry out maintenance, and the light can be lighted for easy identification 【Precise Search】When the test pen detects along the line, the green light will always be on at the position where the line is connected, and the disconnection point at the position where the light is off.