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What is the difference between CALIBRATION and ADJUSTMENT
Calibration and adjustment are two similar processes that are often confused and wrongly used interchangeably. This article aims to clear up the differences. The National Physics Laboratory clearly explains the key differences between CALIBRATION and ADJUSTMENT:
Calibration
Calibration is defined as a set of operations that establish, under specified conditions, the relationship between the values of quantities indicated by a measuring instrument or measuring system and the corresponding values realised by standards. Sometimes, however, the word calibration is misused to describe the process of altering the performance of an instrument to ensure that the values it indicates are correct within specified limits (e.g. adjusting an instrument until its reading agrees with that of another instrument). Strictly speaking this is adjustment.Adjustment

- first calibration (to determine the approximate magnitude of the necessary adjustment)
- adjustment
- second calibration.