Speed. Accuracy. Reliability. These are the cornerstones behind the technology in our digital battery testers. 3183 tests 12 volt batteries (125-1400 CCAs) and analyzes by measuring multiple parameters within the battery to deliver accurate results. A live voltmeter allows easy starting/charging system testing. Its bright,4 digit LED display indicates the battery ’s good/bad status,voltage, and available CCAs. It even compensates for cold temperatures.