The foxwell bt705 is an advanced but still simple to use car battery analyser which gives a comprehensive assessment of the health and charge level of your 12 or 24 volt car batterythe 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 and the rated cca it will give a more comprehensive assessment of the battery at idle you can