When I tried this tool, I was impressed with how quickly and accurately it diagnosed battery and charging issues in my car. The clear display made it easy to understand the results and the compact size made it convenient to carry around .Additionally, the tool was very affordable compared to other diagnostic tools on the market. The only downside was that it did not come with a user manual but I was able to download one online. Overall, this IS an excellent diagnostic tool for any automotive entSee full review