Our value packaged Carbon Pile tester handles all 6/12 Volt batteries. Two large volts. DC test leads are 2.5' 4 AWG cable. Unit comes with manual adjust knob. Buzzer sounds after load is engaged for 15 seconds. Load: 500 A, RNMeter: 4.5" 0-500 A, Voltmeter: 0-16 Volts DC, Leader: 2.5' 4 AWG, Clamps: 400 A Safety Clamps"", Weight: 10 lbs.