500 Amp adjustable load carbon pile. Great tool for simulating actual cranking loads. Tests 12 volt batteries rated as high as 1000 CCA or 160 Amp hour. Can also test alternators regulators and starters. Large dual meters display battery voltage and load current simultaneously during the test. 500 amp side terminal clamps and heavy duty stranded copper cables. Meters are color coded for simple pass or fail diagnostics. Includes temperature compensation chart