General description It is used to control the voltage of the storage battery, featuring reverse connection protection to prevent burning the line. This voltmeter allows for timely monitoring of the battery's voltage state and can also be utilized for measuring voltage in other products. Technical specifications Waterproof Color: Black LED display: Blue Voltage Measurement Range: 6-30V Size: 1.4 inch x 1.4 inch x 0.5 inch Interface type: Anode and cathode Material: Plastic Package Contents 6 x LED DC voltmeter 12 x Blue isolated terminals Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. The measurement allowed error is +/- 1-3cm.