TOPDON car battery tester is an excellent value for money. It allows you to test 12-volt lead-acid batteries. It has 4 test modes: load test, voltage test and two additional modes - startup and charging test, which are available through the app. The tester gives fast and accurate results - displays the battery charge level in just 1 second. Thanks to advanced technology, the measurement accuracy reaches 99.5%. The tester connects to your smartphone via Bluetooth, opening up additional testing possibilities. In the app, you can view real-time voltage graphs and play back saved data. It has polarity and spark protection, as well as long clamps for easy testing.