OBDII diagnostic tool for cars with battery tester function1、KW681 Works on all 1996 and newer 12V gasoline and diesel that are OBD II compliant. 2、It can identify the cause of your CHECK ENGINE and perhaps fix it without going to see your dealer, It also assists you in easily passing annual emissions tests and SMOG CHECK. 3、It covers full OBDII/ EOBD diagnostic functions for engine system. O2 sensor test, EVAP systems test, and board monitoring test give you full control of your vehicle\u0027s running status,while a graphical and numeric live data stream display will help you to find out the faulty sensor readings. 4、KW681 Battery Tester can Test all automotive cranking lead acid battery, including ordinary lead acid battery, AGM flat plate battery, AGM spiral battery, and Gel battery, etc. it adopts the state-of-the -art conductance testing technology in the word to easily, 5、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 vehicle starting system and charging system, which can help maintenance personnel to find the find the problem quickly and accurately, thus to achieve quick vehicle repair.