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A PEX crimp is a precision operation....the tools have to be within specs, and need to be checked at whatever interval the manufacturer and the code book requires.
Better quality tools will hold their spec longer, and not require much adjusment. But any tool is subject to wear and tear, hence the need to calibrate.
The definition of calibrate is to compare an item to a standard, to ensure its accuracy. In both the electrical and mechanical areanas, the majority of tools and instruments are calibrated ( confirmed to spec ) with NO adjustments required.