Fiber microtome testing instruments should be calibrated regularly to ensure the accuracy and reliability of their measurement results. The calibration frequency may vary depending on the specific instrument and its usage, but it is generally recommended to calibrate fiber microtome testing instruments at least once per year.

In addition to the annual calibration, fiber microtome testing instruments should also be calibrated whenever they are repaired, serviced, or moved to a new location. Calibration should be performed by qualified personnel using traceable calibration standards and procedures.

The calibration process typically involves comparing the instrument's measurement results with those of a known reference material or standard sample. The calibration results should be documented and maintained for future reference.

It is important to note that the calibration frequency and procedures may vary depending on the specific instrument and its manufacturer's recommendations, so it is essential to follow the instrument's user manual and calibration instructions. Regular calibration can help ensure the accuracy and reliability of the fiber microtome testing instrument's measurement results and help identify potential issues with the instrument's performance.