Issued by the laboratory, expiring by itself.
We do not calibrate instruments, accredit laboratories, or certify anything ourselves. What we hold is the certificate, created by whoever did the work.
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01
The laboratory issues it
Created by the party that performed the calibration. Not a PDF anyone with a scanner can improve.
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02
It carries its own period
Valid from and valid until, stated at issue rather than typed onto a document that never changes.
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03
The client can check it
The party relying on the instrument can establish its status without asking the laboratory or trusting a binder.
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04
It stops being valid on its date
Nothing has to be noticed, and no reminder has to be read for the status to change.
An instrument that has drifted between calibrations is still a real problem. What ends is one that expired eighteen months ago and nobody saw.
If you calibrate instruments, or depend on them.
Still at the design stage. What would help is a picture of how validity is tracked where you work, and what a missed expiry has cost.