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Wayne brings up an excellent point about temperature affects on calibration. All the spec that I have seen (measurement engineer for 2+ yrs) are for operation in 60 degrees F. If you're working in your cold garage in the midwest or the heat of Arizona, consider the change in calibration of your wrench.
At the factory, we tried to keep temperature at a constant setpoint (can't recall what it was). All calibrations were done at the same temp.
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