"This Milwaukee 400 Amp Clamp Meter is a heavy-duty True RMS electrical current tester for professional, residential, commercial and industrial applications. It's the perfect tool for the professional electrician and includes all the features needed to get the job done in the field, on the jobsite or in the plant. Features a 1in. jaw opening to measure up to 350 MCM cable and can measure voltage up to 600 AC/DC Volts. Battery Included Yes 2, Volts 600 AC/DC, Application Electrical testing, measurement, Jaw Opening in. 1, Display Type LCD, Measures Current AC, Voltage AC/DC, resistance, Amps 400, Capacitance 4000 µF, Resistance 6000 ohms. Measures up to 400 Amps AC/DC Large 1in. jaw opening Thin jaw profile for easier wire measurement in panels or in bundles Wide Voltage range to 600 AC/DC Volts True RMS for accurate measurement in all applications Built-In LED worklight CAT III 600V for increased safety Black-on-white display with backlight for easier reading Rugged overmolding increases durability and user grip Capacitance to 4000 µF"