How often should verification be performed for critical instruments?

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Verification frequency for critical instruments should be defined by how risky the measurement is, how often the instrument is used, and how much drift or change is observed over time. Instead of chasing a fixed schedule, you base the interval on the instrument’s importance to the process and its past performance. If a measurement directly affects product safety, quality, or regulatory compliance, and the instrument tends to drift or is subjected to demanding conditions, you verify more often than routine. If an instrument is stable, rarely used, and controls a low-risk process, the interval can be longer. After maintenance, recalibration, or any event that could affect accuracy, you should tighten the verification schedule again.

This approach balances ensuring accuracy with efficient use of resources. Rigid daily checks regardless of context, or once-a-year checks without regard to performance, can lead to unnecessary work or missed drift. Verification is about maintaining confidence in measurement reliability, adjusting the plan as the instrument’s behavior and process risk dictate.