A calibration certificate is an important official document that serves as a record of the calibration of an instrument and is traceable to the National Institute of Standards and Technology (NIST). The completeness and accuracy of the certificate demonstrates the credibility and effectiveness of the organization that performed the calibration. When an instrument is returned to its owner, it is accompanied by a calibration certificate that documents important information about the instrument's condition, including out-of-tolerance conditions and special measurement situations.

The format of calibration certificates may vary due to geographic and regulatory requirements, but they generally include details such as the calibration date, environmental conditions, in-tolerance or out-of-tolerance conditions, a statement of traceability, and the calibration procedure and intervals. Understanding and preserving these certificates is essential to assessing measurement accuracy and reducing the risks associated with measurement uncertainty.

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