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Just because a scale is in calibration doesn't mean it's accurate or capable for the application. Also, being in calibration in warm weather with no wind does not guarantee that it's in calibration in other conditions. We have scales at work that drift well outside the tolerances to which we're trying to measure when someone leans on the workbench that the scale sits on, or when the HVAC system is running.
The BITW Metro weighed in 6.21lbs lighter after the race than before, according to their score. That's probably pushing the limits of the Glen's measuring system.
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