Well, really good in my opinion if you want to take a screenshot or save the battery diagnosis for comparison or later use. It seems pretty accurate against my Schumacher tester. I think it's $50 and then some more. It also tests your charging system, which I think is pretty cool for a battery tester. If you have to shell out $50 for a tester, that's really good for the price range. A lot of people in these reviews are too picky and complain when the voltage is below 0.01 volts, but you get your money's worth in my opinion.
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