LED ultra-bright color light voltage tester zero live line detection on-off detection intelligent induction, portable pen clip design CR-V alloy bit induction metal cap ABS high transparency pen body LED ultra-bright color light voltage test, self-test function Through the human body circuit, bright green light Before use, self-test and zero live line identification are required Green light is zero line The traffic light is lit together for the live line, and the line is on and off Press and hold the cap and slide along the wire When the green light is off, it is the breakpoint, DC detection Press and hold the copper cap with one hand Press and hold one end of the battery with the other hand The green light indicates that the power is sufficient If it does not light up, it means that the power is insufficient or dead, and the button battery is installed with 3 LR41 button batteries for battery life at any time