Every mechanic knows that his or her tools need to be properly calibrated, but what some don't always understand is precisely why? The reason—the precise importance of calibration, to be exact— is that improperly calibrated tools and measurement devices don't do what you expect them to do. For instance, a click-type torque wrench whose spring is 'out of spec' can end up delivering less torque per turn; resulting in nuts that aren't on as tight as the manufacturer requires. Similarly, a tire gauge that isn't reading properly may result in increased aircraft tire wear due to under-inflation.
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