Hi Marina,
We have never tested or have records of people using the MM912J637 for measuring CCA.
However, MM912J637 is capable of measure temperature, voltage and current, so, if you develop the appropriated firmware I’m sure that you can use it for this application.
If I understand properly, Cranking amps are the numbers of amperes a lead-acid battery at 32 degrees F (0 degrees C) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12 volt battery), you can setup these conditions in your code by measuring temperature, voltage and current with the MM912J637.
Have a great day,
Jose
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