Soondar Blue 0.56" Variable Precision Digital Voltmeter 2.5-30.0V for 3V 5V 9V 12V 24V Connection is simple, just need to pick up two lines, a joint reverse protection, then do not burn Starting voltage is low, only 2.5 V, can correct measurement Variable precision: Precision automatic change below 10.0 V, the highest resolution of 0.01 V, Precision automatic 10.0 V above changes, the highest resolution of 0.1 V Can be used for measuring the car / battery car / motorcycle battery voltage, and other forms of voltage Can be used in all kinds of voltage measurement purposes