DUOYI DY222 Car 12V / 24V Battery Tester1. The battery tester is designed for testing the conditions of the 12V & 24V lead acid starting battery, cranking system and charging system. 2. It comes with a large 3. 2 inch color LCD screen and it supports classic touch tone to help you read and operate more efficiently. 3. It utilizes 4 wire Kelvin method to complete the collection of a series of complicated data for calculating every testing data with a build in precise circuit and improved
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