The NOCO Battery Load Tester is a quick and easy tool for testing a good, weak, or bad battery by measuring the voltage under load (up to 100 amps). Tester provides quick and reliable results within 10 seconds. Suitable for use with 6V and 12V lead-acid batteries, including wet cell, gel cell, maintenance-rree, EFB, and AGM up to 1000 CCA. Features built-in capabilities for testing engine cranking ability, charging system, and starter motor performance. Measures 13.1" x 6.6" x 3.6".