Car battery tester 12V-24V digital voltage load analyzer DY2015A1、This car battery tester tool can indicate the battery and the vehicle's electrical system: Battery capacity (voltage, CCA, internal resistance, SOH), cranking load, maximum working load, charging system during four main test results. 2、This battery tester is available for all 12v and 24v starter lead acid batteries, great compatible with agm flat plates, spiral agm and gel batteries. 3、This battery analyze tool has reverse connection protection and overvoltage protection. It can secure the user and prevent any damage to the vehicle's battery or electrical system. 4、This electrical battery tester covers all battery classification standards: CCA/JIS/DIN/IEC/EN. So you don't have to worry about its practicality in daily life and work. 5、This battery tester tool will let you read easily the conclusion of the battery condition good / ok / pay attention / replace as suggestion. You can easily judge whether the battery can be used normally.