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[Show Extended Battery Data] Apply the battery analyzer to measure with the latest conductivity method, the tester will analyze the battery and provide you with accurate test results. Including internal resistance test, voltage test, state of health (SOH), state of charge (SOC) and CCA value test. [Fast Speed, 99.6% Accuracy] Built-in intelligent microprocessor makes the test relatively fast and accurate. Test results can be displayed in two seconds. Car Battery TesterBM550 can test all 6V/12V/24V 100-2000CCA batteries, including ordinary flooded, flat AGM, spiral AGM or gel batteries. Provides overall battery status analysis to help you understand the state of your batteries before they die. Test results are based on CCA standards. [Plug and Play] BM550 Battery Load Analyzer allows you to test car and car batteries, even dead batteries. Simply connect the tester clip to the battery and it will power on and be ready to test and analyze the battery. It's so easy [Safety and] Designed with reverse polarity connection. If the positive and negative poles are reversed, it will not damage the device and will not affect the car or the battery.