The ACT CHROME 12V SLA Battery Tester uses advanced pulsed load technology to deliver accurate DC Voltage and Ah capacity results based on the battery temperature and state of charge. A quick look up table on the side of the unit identifies when batteries should be recharged or replaced due to age or operating conditions 65 percent of rated capacity . A temperature sensitive strip allows the ambient temperature to also be recorded. The ACT CHROME 12V SLA Battery Tester offers a simple and accurate solution for testing 12V SLA batteries commonly used in fire, security and many other electrical systems. Supplied: ACT CHROME 12V SLA Intelligent Battery Tester, ACT 3532 Terminal Connectors, ACT 410N Soft Carry Case, Sample ACT BTL Labels, Operating Instructions and Certificate of Calibration