5 Pieces 0.28 Inch Mini Digital DC Voltmeter, Voltage Tester Mini DC Voltmeter Two Wires 2.5V-30V – 5 Colours

Two-wire connection, with reverse polarity protection. And with fine tension adjustment function. Measuring range: DC 2.5-30V (red), 2.6-30V (yellow/green), 3.2-30V (blue), 3.0V-30V (white). Max. Input Voltage: DC 30V Above 40V, there is a risk of burning. 0.28 inch LED display. Small size and lightweight, quite easy and convenient to make. Automatic precision adjustment: when the measurement value is less than 10V, then accurate to 0.01V, more than 10V accurate to 0.1V.