Calibration Register

The Calibration Register logs every measuring instrument your organisation relies on for quality or safety decisions — its serial number, when it was last calibrated, who calibrated it, the certificate number, and when it's due for calibration again.

A measurement is only as trustworthy as the instrument that took it. An out-of-calibration gauge or instrument can silently produce readings that are wrong by a consistent margin, which is far more dangerous than an instrument that obviously fails, because nothing about the reading itself looks wrong. Tracking a due date per instrument, separately from when it was last calibrated, makes it possible to see at a glance which instruments are approaching or past the point where their readings should no longer be relied on.

Each entry is a single instrument's calibration record: what the instrument is, its serial number, the date it was calibrated, the date it's next due, who performed the calibration, and the certificate number issued for that calibration. There is no separate "in service" / "out of service" status field — an instrument's currency is read directly from whether its calibration due date has passed, not from a separately maintained state.

The list page shows every instrument with its calibration due date, and can be sorted by due date or by when the record was created or updated, so instruments coming due soonest can be found quickly. The detail page shows the full record; create and edit forms share the same fields.

• Instrument — required. What the instrument is (e.g. "Digital torque wrench").
• Serial number — required. The instrument's own serial number, for positive identification.
• Calibration date — required. When this calibration was performed.
• Calibration due — required. When the instrument is next due for calibration.
• Calibrated by — required. Who or which calibration body performed the calibration.
• Certificate number — required. The certificate issued for this calibration, for traceability back to the calibration provider's own records.

Creating or editing an entry validates that every field above is present before it can be saved — there's no optional field on this form.

There is no automated reminder or block triggered by an instrument's calibration due date passing in the current version of the product — the due date is a field to sort and monitor, the same way Safe Work Procedures' review dates work, not an enforced gate on using the instrument elsewhere in the system.

Can one instrument have more than one calibration record over time? Yes — nothing prevents creating a new entry for the same instrument (matched by serial number) each time it's recalibrated, which keeps a full calibration history rather than overwriting the previous one. The register doesn't automatically link successive calibrations of the same instrument together; that's inferred from matching serial numbers, not a stored relationship.