Is a calibration sticker proof of traceability?

No. The sticker records that a calibration happened; the certificate with its uncertainty and reference standards is the evidence of traceability.

Does traceability require an accredited laboratory?

Not strictly, but an accredited certificate is the accepted way to demonstrate the chain without auditing the laboratory yourself.

Can a result be traceable without an uncertainty?

No. Each link contributes to the uncertainty of the result; a link with no uncertainty is not a calibration in the metrological sense.

Metrology

Metrological traceability explained

Traceability means a result can be related to the SI through an unbroken, documented chain of calibrations, each with a stated uncertainty. Here is what that requires in practice.

ValiTrac AI editorialUpdated 2026-09-132 min read

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Metrological traceability is the property of a measurement result whereby it can be related to a reference — normally the SI unit — through a documented, unbroken chain of calibrations, each contributing to the measurement uncertainty. The definition has three load-bearing words: documented, unbroken, and uncertainty.

What breaks the chain

A reference whose own calibration is missing, expired beyond its documented interval, or not traceable itself.
A comparison with no uncertainty evaluated — a 'check' rather than a calibration.
A link that cannot be produced on request: the documentation is part of the chain.

Practical evidence

For most organisations, traceability is demonstrated by calibration certificates from laboratories accredited to ISO/IEC 17025 by a body within the ILAC mutual recognition arrangement, or from national metrology institutes. The certificate must state the uncertainty and identify the reference standards used.

Frequently asked questions

Is a calibration sticker proof of traceability?: No. The sticker records that a calibration happened; the certificate with its uncertainty and reference standards is the evidence of traceability.
Does traceability require an accredited laboratory?: Not strictly, but an accredited certificate is the accepted way to demonstrate the chain without auditing the laboratory yourself.
Can a result be traceable without an uncertainty?: No. Each link contributes to the uncertainty of the result; a link with no uncertainty is not a calibration in the metrological sense.

References

[1]JCGM 200:2012 — International vocabulary of metrology (VIM), 3rd edition
[2]ILAC-P10: ILAC Policy on Metrological Traceability of Measurement Results
[3]ISO/IEC 17025:2017 — General requirements for the competence of testing and calibration laboratories

General technical guidance written against the cited sources. It is not regulatory or legal advice and does not replace the applicable standard, guideline or a qualified reviewer's judgement.

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