First of all I would like to thank you all for taking the time to answer my questions. This load tester is very easy to use. The guide says to add or subtract depending on the temperature and cold cranking amperage of the battery. Since I tested the battery at 40 degrees, the low temperature compensated for the extra battery power on cold starts. I tested two different cars and both batteries were good. I first tested the machine with a new battery and the tester said it was in great condition (as expected). I'm glad I listened to you and bought this load tester. This digital load tester costs extra money.
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