DC 0-50V 0.36" Display 4 Digits 7 Segments 3-wire Red LED Voltmeter This Voltmeter has LED display Screen for conveniently and easily reading. With reverse polarity protection function, line reversed will not burned. The measuring Range of this Voltmeter is from 0V to 50V. Widely used in autos, aircraft, test instruments, hydro power system. Fit for voltage indications and monitoring electrical systems.