Food safetyTemperature monitoring
Temperature probe checks: what belongs in the verification record?
A probe verification record should connect the instrument to the approved method, reference used, observed results, acceptance criteria and disposition. Keep verification, adjustment and calibration terminology distinct so a reviewer understands what was actually done.
At a glance
A probe verification record should connect the instrument to the approved method, reference used, observed results, acceptance criteria and disposition. Keep verification, adjustment and calibration terminology distinct so a reviewer understands what was actually done.
Define the decision behind the record
Start with an instrument register and a procedure appropriate to the equipment. Recording a check against a reference is not automatically the same as obtaining a calibration certificate. Do not invent an acceptable tolerance in the software merely because a form requires one.
Record the method, reference and service decision together
Identify the probe and whether the activity is a verification check or a calibration within your measurement procedure. Prepare the approved method, suitable reference, acceptance criterion and authorised role. A generic checklist should not prescribe an improvised test method or substitute a different reference because the usual one is unavailable.
Keep reference values, observed readings, units and calculated differences for each applicable test point. Record the reference identity and its relevant status so another reviewer understands what was compared. If an adjustment occurs, distinguish results before and after adjustment instead of retaining only the acceptable final reading.
The decision should address instrument status and any required review of earlier measurements under the site procedure. Link repairs, provider certificates or repeat checks to the original activity. Test the record by removing the pass/fail label: a reviewer should still be able to follow the comparison and determine why the instrument was retained, restricted or referred for further work.
Worked example
A kitchen checks a probe under its approved method and finds a result requiring review. The record identifies the probe and reference, preserves the values and documents the decision. The reviewer considers any necessary follow-up on earlier measurements.
Build a usable record
Use the fields below to capture the facts needed for this particular decision. Keep the actual observation separate from any later correction or approval.
- Instrument identifier and responsible person
- Approved method and reference identity
- Observed results, units and criteria
- Adjustment or restriction if applicable
- Reviewer and next planned check
Example record and review decision
Fictional record example: PROBE-01 / CHECK-01: reference identity, method, reference value, observed value, unit and approved tolerance; REVIEW-01: instrument status.
Determine whether this was an internal verification or a calibration activity. Retain the actual values rather than just a pass symbol.
If the reference identity or tolerance is missing, a pass result cannot be independently reproduced from the record.
Test the review, not just the form
Pick a probe and recover its latest record without relying on its nickname. Check whether another person can distinguish an observation, an adjustment and an external certificate. The record should explain instrument status to the next user.
A few useful answers
Can an app issue a calibration certificate?
A software record does not establish that a calibration service occurred. Describe the actual check and retain any genuine certificate separately.
Are verification and calibration interchangeable labels?
Use the term for the activity actually performed under the approved procedure. Preserve its method, reference and results. A simple internal check should not be presented as a different service or certification merely because the form has a calibration heading.
Sources and further reading
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