KONNWEI digital tester works with 12V car batteries and alternators. It allows for efficient testing of batteries in various vehicles. It supports all power sources in the 100–2000 CCA range, including flat-plate and spiral AGM batteries, lead-acid, and others. When connected, the scanner checks the battery and displays all data on a small LED-backlit screen. It provides information on internal resistance, charge status, capacity, cranking current, and voltage. If issues are detected, it will recommend actions to take. The measurement accuracy is 99.99%. It is operated via large buttons on the body.