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Calibration Certificate Template

A calibration certificate is the proof that an instrument was checked against traceable standards, and by what method. This template assembles the key fields into a clean document you can print, sign or export to Word.

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Calibration Certificate Template

Calibration Certificate

Certificate number: CAL-2026-0412 Laboratory: Acme Precision Metrology Lab Date of calibration: 2026-10-19 Recommended due date: 2027-10-19

Customer and Instrument

Customer: Acme Precision Ltd Instrument: Digital caliper, 0-150 mm Asset or gage ID: CAL-0012 Manufacturer and model: Mitutoyo, digital caliper Serial number: A1234567

Method and Standards

Procedure: WI-MET-014 Calipers, Rev C Reference standards: Gage block set GB-0002, certificate EXT-76310 Measurement traceability: the reference standards above are traceable to national or international standards through an unbroken chain of calibrations.

Environmental Conditions

Temperature: 20.4 C Relative humidity: 46 %

Results

NominalReference readingInstrument readingErrorTolerance (+/-)Pass or fail

Condition and Statement

As-found condition: In tolerance As-left condition: In tolerance

The reported expanded uncertainty is stated as the standard uncertainty multiplied by a coverage factor k=2, which for a normal distribution corresponds to a coverage probability of approximately 95%.

The results relate only to the item calibrated. This certificate shall not be reproduced except in full without written approval of the laboratory.

Authorization

Calibrated by: J. Rivera Approved by: S. Patel

Calibrated by / Date
Approved by / Date

Starting point, not legal advice and not an accredited document. A certificate issued under ISO/IEC 17025 accreditation must carry the content required by the standard and your accreditation body, including the accreditation symbol rules. Fill in the uncertainty per test point in the table.

Generate certificates from your calibration records

Interested in producing certificates automatically from data in your ERP or QMS? We can discuss the approach.

Optional. The tool and every export work without this. No spam.

How to use it

Enter the lab, customer and instrument details, the procedure and reference standards used, and the environmental conditions. Set the as-found and as-left conditions, edit the uncertainty statement to match your budget, and add the names of the technician and approver. Export to PDF or Word, then complete the results table with your readings, errors and pass or fail decisions per test point. Assign a unique certificate number that your calibration log can reference.

What a certificate normally contains

ISO/IEC 17025 clause 7.8 describes the content of calibration certificates. In practice that means: title, laboratory name and address, unique identification, customer, item description and identification, date of calibration, method used, results with units, measurement uncertainty with coverage factor, traceability statement, conditions where relevant, and the name and signature of the authorizer. Shop-internal certificates do not have to be accredited but benefit from the same structure.

  • Unique certificate number
  • Item ID and serial number
  • Method and standards used
  • Results with uncertainty
  • As-found and as-left condition
  • Authorized signature and date

Common mistakes

The costliest error is omitting as-found data when an instrument is adjusted, which wipes out the evidence you need to judge earlier measurements. Others include missing standards traceability, blank uncertainty, no unit on results, and a due date the lab was not asked to set. Do not claim accreditation unless the lab holds it for that scope. Also keep a copy tied to the gage ID in your calibration log, since a loose certificate is hard to find during an audit.

Frequently Asked Questions

Can I use this as an accredited certificate?

Only an accredited laboratory can issue an accredited certificate, and it must meet the content rules of ISO/IEC 17025 and the accreditation body for the scope. This template suits internal and commercial calibration documents that make no accreditation claim.

Does the certificate need to show uncertainty?

For calibration under ISO/IEC 17025, yes, the measurement uncertainty and coverage factor must be reported. For internal shop calibrations it is good practice, especially if pass or fail decisions are near the limits.

Should a due date appear on the certificate?

Under ISO/IEC 17025 a calibration certificate should not contain a recommendation on the calibration interval unless agreed with the customer. Many commercial labs still print a recommended due date. Use it only where the customer asked for it.

What is as-found versus as-left?

As-found is the condition of the instrument when it arrived, before any adjustment. As-left is the condition after adjustment. Keeping both lets you judge whether earlier measurements were affected and feeds interval reviews.

If you issue many certificates, Netray can help generate them from calibration data held in your ERP or QMS.

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