The Foxwell BT705 is an advanced, but still simple to use car battery analyser, which gives a comprehensive assessment of the health & charge level of your 12 or 24 Volt car battery. The tool will immediately give a voltage reading on connection to the battery. Then by simply answering a few on-screen questions (such as whether the battery is in the vehicle, the type of battery, the battery standard & the rated CCA), it will give a more comprehensive assessment of the battery at idle. You can then choose to proceed with additional tests while starting the engine & running the engine with high electrical load (heaters & high-beams on) to evaluate the high-load & charging characteristics of the battery.