A familiar annual date is not a substitute for understanding how a measurement system is used. The interval needs a basis relevant to the application.
NIST's calibration-interval guidance does not prescribe one universal interval for every measuring instrument. NIST — Recommended calibration interval.
Review the relevant factors
For a production measuring device, consider applicable requirements, use conditions and available performance history with the responsible specialist. Keep the interval decision separate from a supplier's convenient service calendar.
Revisit when conditions change
A changed use or concerning observation may justify review before the planned date. Follow the applicable measurement-control process rather than assuming the calendar alone establishes continuing suitability. Record the reason for the selected interval and subsequent changes.
Source reviewed 25 October 2026. Interpretation and original diagrams: PLUSHIP / Qunhe. Examples are illustrative.
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