The BK Precision 603B 6V and 12V Handheld Battery Capacity Analyzer with Record Storage is a handheld battery capacity analyzer that can test 6 and 12 volt sealed lead acid batteries with capacities up to 100 ah. Test results include voltage, state of charge, and internal resistance. This analyzer also features a built-in USB port and internal memory to store battery information, test configuration, and measurement results for up to 50 batteries. The 603B analyzer is an ideal choice for testing sealed lead acid batteries commonly used in intrusion detection, fire alarm, security camera, access control, industrial control, and other battery backup systems.