Extech BT100 Battery Capacity Tester

Amazon

Replacement flat surface electrode for ExStik chlorine meter Easy to clean, rugged flat surface Chlorine electrode Measures Chlorine and temperature Interchangeable with ExStik pH or ORP meter Complete with protective connector cap Checks battery condition in seconds while the battery is in service On-line testing without shutting down battery Built-in datalogger stores up to 999 tests Simultaneously measures battery resistance and voltage PC software for downloading readings to a PC

Test-meter.co.uk

Extech BT100 battery tester for multiple battery types. Measures internal resistance and voltage simultaneously. On-line testing, 1kHz current. Built-in datalogger (999 tests). Includes PC download software.