DMiotech DC 0-100V 50A Red Blue LED Display Panel Guage 2 in 1 Ammeter Voltmeter Meter Voltage Ampere Monitor Tester Made of good quality plastic and electronic component material and finished by good technology. Need to connect with a 50A 75MV shunts. Uses in autos, marine, aircrafts, test instruments, solar, wind, hydro power system etc for voltage current indications and monitoring electrical systems. High accuracy, low power consumption. Easy to test. Panel mounting is easy to install.