Which of the following is NOT identified by a calibration label?

Calibration labels are designed to convey specific details regarding the calibration status and procedures associated with instruments or equipment. They typically include critical information that ensures compliance with calibration standards, tracking, and maintenance requirements.

The calibration date is essential as it indicates when the last calibration was performed, helping users determine if the equipment is still within the calibration period. The serial number is crucial for identifying the specific item being calibrated, ensuring that the correct equipment is being maintained and logged properly. The calibration activity reflects the specific checks or adjustments that were conducted during the calibration process, providing transparency and accountability.

In contrast, maintenance history is not typically included on a calibration label. Maintenance history refers to a comprehensive record of all maintenance actions performed on the equipment over time, which could encompass routine servicing, repairs, and other operational activities. This information is generally maintained in a separate documentation system or log rather than on the calibration label itself. Therefore, the maintenance history is not identified by a calibration label, making it the correct answer to the question.