My first readings showed my 650CCA battery was at 1000CCA. I cross-checked the DC voltage with two other meters and found that the stress tester gave high readings. I used the adjustment screw on the face of the meter to calibrate the DC voltage on my meters and retested the battery charge. Presto, over 600 CCAs. If you look around you'll see that it's the same device sold under different names at double the price.
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