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From the description, I don't see any mention of capacity measure. I'm not sure how one would extrapolate capacity from an internal impedance measurement. I could be wrong, but I only know to measure the drain on a battery to determine the remaining capacity.
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From the blurb:
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It measures the actual cold cranking amps(CCA) ,capability of the battery,the State of Health(SOC),the State of Charge(SOH)
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It does compute the CCA from the internal resistance. The formula used is
CCA = 3051.85 / R where R is in μΩ. Which you can do in your head.
This meter can measure the internal resistance of the battery, which you can't do with just an ohm-meter. I assume your resistive CCA meter is a smokin' hot load.
If the battery has a stated CCA you enter that and it tells you % of capacity. Which you can do in your head too.
-m