I alternated them double checked then checked again. I'm gonna wait for the snap on guy to come on Friday to recalibrate my torque wrench but I feel its accurate. Been in the case never dropped it but I'll double check that as well. Big red that makes sense about the spinning forces. Its about 10- 12 thousandth difference so I don't know if I'm being over cautious, but better safe then sorry. Thanks for the input