Blue Sea Systems AC/DC Digital Meters Displays amperage from -500 to +500 Amps .Displays voltage from 0 to 60 Volts in 0.01 Volt increments High and low voltage, audio and visual alarms. 3 levels of display brightness. Splashproof front Standard meter operates in negative side of circuit only. Shunt Shifter required for positive side installation such as alternators Includes 500 Amp shunt Input voltage: 7-60V DC BLUE SEAS 8248