OM129 code readers and scan tools combines all OBD2 functions and battery test function into one (Real 2-in-1 Code Reader), which can not only help you check the car engine fault, but also check the car battery\'s health status. Besides, this obd2 code reader can display these live data in a supported text and graphical format. Besides, a graph contains multiple data, so you can see how they change in real time, definitely your first choice