Battery Charger is designed to charge 12V lead-acid/AGM batteries from 4AH-120AH, check battery manufacturer specifications before using this charger. Battery Tester adopts the advanced conductance testing Technology in the word to easily, quickly and accurately measure the actual cold cranking amps capability of the vehicle starting battery, healthy state of the battery itself, and common fault of the battery, which can help maintenance personnel to find the find the problem quickly and accurately, thus to achieve quick vehicle repair.