GVDA GD107 Pen Type Smart Digital Multimter With High Voltage Alarm

GVDA GD107 Pen type Smart digital multimter with High Voltage Alarm

You can use the red probe contact to the conductor to test wires. When the weak electric field signal is detected， it will display"---L"，the buzzer will sound slowly and the green light on. When the strong electric field signal is detected，it will display "---H"， the buzzer will sound quickly and the red light on.