1Test and analyze battery load system, indicating battery condition include battery life percentage, CCA, battery voltage,battery resistance. 2Continuous test with battery power, no damage to battery, and the reverse polarity and over voltage protection make it to be ultra safe. 3Complete wide CCA test range (100-1700), offer reliable and accurate operation for more sized batteries. 4Great compatible with most 12 volt battery type(include Flood battery, AGM battery, Gel battery, Deep Cycle Battery), work fast and precisely. 5Come with large LED screen and heavy duty clamp, and beep remind function make it to be more durable and reliable. 6With compact shape, stable performance, shockproof, lightweight and portable, take up no space and you can put it anywhere.