The Electronic Specialties 500 Amp Carbon Pile Load Tester, No. 710, performs variable load testing on 12V batteries rated as high as 1,000 Cold Cranking Amps. The No. 710 features large dual meters to display the battery voltage and load current simultaneously, during the test. The carbon pile load current is completely adjustable from 0 amps to 500 amps, to match the size and rating of the test battery. The unit features an audible tone indicating the end of the 15-second test. The dual meters are color-coded for simple pass/fail test results.