It was noted that the 2000 MLB baseball wall-COR test results varied with the test location. In Costa Rica and Missouri, the observed COR readings using the Rawlings COR setup were typically 0.56 and 0.57, respectively. The results measured in Massachusetts averaged 0.55. These differences are likely a combination of the ball moisture content and the testing apparatus. To ensure a fair comparison, all balls tested in this UML study received the same pre-test storage in a controlled environment and were tested using the same equipment.
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