I've used this on several car batteries and it's been accurate. It is easy to use and easy to read as well. I had a problem with it when he diagnosed that a 1998 Corvette's battery was only 8.6v, but when the car owner took the battery to the auto parts store, they checked the battery as good, not knowing what the discrepancy was. The instructions are quite difficult to understand but if you are looking for a cheap battery tester I think you need this.
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