What information is typically recorded on calibration certificates?

• A. The calibration frequency
• B. The standards used, uncertainties, and dates
• C. The device model and serial number only
• D. The test artifacts and operator initials

Answer: (C)

Calibration certificates exist to prove that an instrument’s measurements are reliable and traceable to recognized standards. The most important pieces to include are which standards were used, the measurement uncertainties, and the date of calibration (often with a due date for the next one). This combination shows the reference framework for the measurements, how confident the results are, and when the instrument’s calibration is valid.

Including the standards used ensures traceability to established references. Stating the uncertainties quantifies how much the measured values may vary, which is essential for assessing whether the instrument meets needed tolerances. Recording the calibration date (and due date) establishes the validity period and helps schedule future calibrations.

While recording the device’s model and serial number is important for identifying what was calibrated, it does not by itself demonstrate traceability or the quality of the measurements. Other details like calibration frequency may be managed in asset records, not on the certificate itself, and test artifacts or operator initials are not standard certificate contents.

So the best choice focuses on the standards used, the uncertainties, and the dates, since these are the elements that prove the instrument’s measurements are traceable and within specified accuracy during a defined period.