Dc 2 Wires 4.5-30V Mini Led Digital Display Voltimeter Voltage Panel Meter Tester Tool

Characteristics: This fullmeter wiring is simple, it only needs two wires, the red wire is connected to the positive pole, the black wire is connected to the negative pole, there is protection when the wires are not connected correctly, the electrical circuit will not be bummed This voltmeter does not need external drive work power, it can work with measured voltage, the operating voltage range is 4.5-30V Toreach the best measurement accuracy, this voltmeter automatically move the commas posi