Calibration Checklist Template (UK)

A calibration system does not fail all at once. It degrades in specific, predictable ways between audits — certificates get filed without being read, an instrument moves bench and nobody updates the register, a label from two calibrations ago stays stuck to a micrometer. Each is small. Together they are what turns an audit into a scramble.

This is a checklist for catching those, run quarterly on your own system. It is deliberately not audit preparation: the point is that a system checked four times a year does not need preparing.

Why a Self-Check Is a Different Job

Audit preparation is assembling evidence for someone else against a deadline, and it rewards tidying. A self-check is looking for what has gone wrong so it can be fixed while fixing it is cheap. The ground overlaps — the calibration audit checklist covers what an assessor examines and is the right reference when an audit is actually coming — but the mindset is opposite. Audit prep wants everything to look right. A self-check that finds nothing has probably not been done properly.

Budget more time than feels necessary for a large fleet — most of it goes on the first item.

The Checklist

1. Does the register match the floor?

Two spot-checks, in both directions, because they fail differently.

Pick five instruments from the calibration register and find them physically. Anything you cannot locate is either missing, retired without being recorded, or in a drawer someone forgot about.

Then walk a work area and pick five instruments you can see. Find each on the register. Anything in use and absent is the more serious direction — an instrument being used for measurements with no calibration control at all.

2. What is overdue, and what is about to be?

Overdue instruments still in service are the classic finding. List them, and for each one establish whether it is genuinely overdue or whether the register is simply stale. Then look forward far enough to cover your calibration turnaround — if your laboratory typically takes a few weeks, anything due inside a month needs booking now rather than noting.

3. Have returned certificates actually been read?

This is the item most often skipped, and the published guidance is direct that it should not be. UKAS TPS 41, Edition 6, section 3.2:

"When a fresh calibration has been obtained the data provided should be reviewed in order to confirm that the declared performance is still met. It may be necessary to reconsider the calibration interval or the suitability of the equipment in accordance with the outcome of such a review."

A certificate that arrives, gets scanned and gets filed has not been reviewed. So: take the certificates received since the last check and confirm someone looked at the results and made a decision. Filing is not a decision.

4. Should any intervals change?

Falls straight out of item 3. Instruments repeatedly found comfortably within tolerance are candidates for a longer interval; instruments found near or outside their limits need a shorter one. You are not reviewing every instrument every quarter — only the ones that have been calibrated since the last check and whose results say something. The methods for adjusting intervals cover how to make the change defensibly, and the as-found readings in the calibration log are the evidence it rests on.

5. Were out-of-tolerance events closed out?

For each out-of-tolerance finding since the last check: was the impact on previous measurements assessed, was that assessment recorded, and was the resulting action completed? Out-of-tolerance events tend to be handled urgently at the instrument end — quarantine, recalibrate, return — and left open at the paperwork end, which is the half an assessor asks about. The out-of-tolerance procedure covers the full sequence.

6. Are the labels current?

A quick physical check on the instruments you handled in item 1. Applying the label is the calibrating laboratory's job, not yours — but confirming it is there, legible, and current is a check worth doing at your end too. UKAS LAB 5, Edition 5 notes at section 4.3 that superseded UKAS calibration labels should be removed or cancelled — worth checking for, because an instrument wearing two labels is an instrument whose status cannot be read at a glance, which defeats the purpose of labelling it.

7. Has anything entered or left scope?

New instruments in use that have not been assessed. Existing instruments whose use has changed — an indicating-only gauge that has quietly started producing numbers someone records. Instruments retired or disposed of but still on the register. What equipment needs calibration covers the test; this item is just asking whether anything has moved across the line since last time.

8. Are the records where the plan says they are?

Pick two instruments and follow the path an assessor would: instrument, to identifier, to current certificate. If that takes more than a minute or ends in a folder of PDFs with unhelpful filenames, the finding is about retrieval rather than compliance — but it is the one that makes audits painful. Retention itself is covered in how long to keep calibration records.

What to Do With the Output

Write down what you found, including the items that were fine. Two reasons: it is evidence the review happened, and the pattern across quarters is more informative than any single check. The same finding three quarters running is a process problem, not an oversight — if labels are wrong every time, the issue is that nobody owns updating them when instruments come back.

Anything you fix during the check is fixed. Anything you cannot fix in the hour goes on a list with an owner and a date, and gets picked up at the next check. A self-check that generates a list nobody actions is just a slower way of discovering the same problems at audit.

Where the checklist repeatedly surfaces the same structural issue, that belongs back in the calibration plan as a change to the process rather than another correction.

Why These Eight

They are the items that decay without anyone deciding they should. Nobody chooses to stop reviewing certificates; the certificates simply keep arriving and reviewing them keeps not being urgent. Nobody decides to leave a superseded label on. Every item above is a place where the system depends on a manual step happening reliably, forever, with no prompt — and that is the definition of the thing that will not happen.

Which is also why the checklist is the mitigation and not the fix. If item 3 fails every quarter, the answer is not a better checklist; it is that certificate review needs to be prompted rather than remembered. Most teams reach that conclusion somewhere around the point where the register outgrows what one person can hold in their head, which is roughly where the spreadsheet-versus-software comparison starts to matter.

How CalProof Fits

Several of these items stop needing a quarterly check when the system prompts them. Recall reminders fire on a fixed schedule ahead of every due date — 30, 14 and 7 days out, on the day, and a week after — so item 2 is continuous rather than quarterly. Certificates attach to the instrument record with its history, so items 3, 4 and 8 are a screen rather than a hunt. The dashboard shows overdue and approaching status across the fleet without assembling it.

What remains genuinely manual is the physical half — items 1, 6 and 7 need someone to walk the floor, and no system replaces that.

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The ISO 9001 Clause 7.1.5 self-assessment covers the wider requirement if you want a broader check than this one. To see the shape of the output, the sample audit pack is ungated and downloads as a single PDF.

Sources

• UKAS TPS 41, Edition 6 (December 2022) — UKAS policy on metrological traceability (section 3.2)
• UKAS LAB 5, Edition 5 (January 2025) — Reporting calibration results (section 4.3)

This guide applies to UK manufacturers and laboratories working to ISO 9001 or ISO/IEC 17025. It is general guidance based on published UKAS policy; what your own system needs to check depends on your scope, your equipment and your assessor's interpretation. Verify against your certification body or UKAS assessor. This is not legal or compliance advice.