Which of the following is a common use of calibration certificates?

A calibration certificate serves as a formal document that verifies the accuracy of measurement instruments after they have undergone calibration. This certificate typically includes details such as the measurement standards used, the results of the calibration process, and traceability to recognized standards. The main purpose of these certificates is to confirm that the instruments are functioning correctly within specified tolerances, which is crucial for maintaining quality control, ensuring consistent manufacturing processes, and supporting regulatory compliance.

The other options do not accurately reflect the primary use of calibration certificates. For instance, while they may indirectly support compliance with environmental regulations, they are not specifically designed for that purpose. Calibration certificates also do not serve as a solution for equipment failures, nor do they relate to documenting employee performance. Instead, they focus on providing evidence about the reliability and accuracy of measurement instruments. Thus, verifying measurement accuracy stands as the clear and primary function of calibration certificates.