Carbon Pile Load Tester handles all 6/12 Volt batteries. Two large 4.5″ meters display amperes and 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. Tests batteries up to 1000 CCANarrow thread shaft for fine adjustmentLarge scale ammeter and voltmeter with color coded numerical scale400 amp heavy gauge copper jaws in insulated clamps2.5′ 4 AWG Leads Voltage sensing leads buried in cables to prevent damage1 year warrantyLoad Capacity: 500 ampAmmeter: 4.5″ 0-500 ampsVoltmeter: 0-16 voltsDC Leads: 2.5 ftClamps: 400 amp / 15 second ratingShipping Dimensions: (HxLxW) 7″x12.5″x11″Weight: 10lbs.