Car Battery Tester can test all 9-18 V batteries, including ordinary flooded, flat AGM, spiral AGM or gel batteries. Provide a general analysis of the battery condition and help to know its condition in advance before it runs out. Test results based on CCA standard. Fast and> 99.6% accuracy With built-in intelligent microprocessor, which makes the test fast and accurate compared to American Midtronics. accuracy index is up to 99.5%. At the same time, test results can be displayed in two seconds. Plug and Play Battery Load Analyzer allows you to test batteries both inside and outside the vehicle, and even test discharged batteries. Just connect the tester terminals to the battery, then it will turn on and be ready to test and analyze the battery. It's so simple! Safety and protection Designed with reverse polarity protection. If the positive and negative poles are reversed, this will not damage the device or affect the car or battery.