The CTEK Battery Analyzer tests the condition of 12V lead-acid batteries including wet, maintenance free, Ca/Ca, gel and AGM styles. The easy to use, hand-held device needs only to be connected to the positive and negative poles of the battery before following the step by step instructions on the display. Then, it tests the battery in seconds and provides fast and easy to understand results on its condition. Four levels indicate the state of the battery and any action to be taken from Battery Good; Good/Recharge, Charge & Retest or Replace Battery. The Charge and Test feature ensures the battery can retain its charge.