How to detect the Zero Fire wire via GVDA GD110A Voltage Detector Continuity Voltage Display Electric Tester Screwdriver AC/DC 12-300V Voltage Indicator Breakpoint Finder
When the probe is placed close to the AC voltage, the buzzer sounds and the voltage level will show on the display. The higher the voltage, the more rapid the buzzer sounds. Likewise, "HI" on the display indicates high voltage, "U" indicates low voltage. With this function, you can differentiate between Null and Live wires, or find the breakpoint of the wire.
