ATD Tools 5488 100 Amp Battery Load Tester Tests 6 and 12 Volt batteries up to 1000 cold cranking Amps For conventional and maintenance free batteries in cars, light trucks, lawn tractors and RVs; Completely portable-external power source not required; Simple to use Completely portable-external power source not required; Complete test done in 10 seconds Accurate and Dependable; Heavy duty, shock-resistant ventilated cover Color-coded copper-plated clamps; Replaces: ATD-5495