uxcell Red LED Digital Display DC 0-20V Voltage Test Panel Voltmeter This voltmeter is for voltage testing, DC type. Can measure 0-20V. Uses in autos, marine, aircrafts, test instruments, solar, wind, hydro power system etc for voltage indications High accuracy, low power consumption. Easy to test. Panel mounting is easy to install. A good car accessory to measure voltage efficiently and quickly.