Does a simple steel ruler require calibration?

by Amit
(India)

To what extent one must go for calibration of instruments ? Should we include equipment like a scale or weighing balance or a traditional heat chamber which displays temperature inside ?
My opinion is to get any instrument calibrated if it affects (directly or indirectly) product/process conformity.
But then everything can affect directly or indirectly if we go by an auditor's perspective.

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