The term "metrology rule of thumb" refers to a general guideline or principle used in metrology, which is the science of measurement. These rules of thumb are based on common sense, experience, and practical knowledge, and are often used as a starting point when making measurements or evaluating the accuracy of measurement systems.

Some examples of metrology rules of thumb include:

The "rule of 10" - this rule states that the measurement uncertainty of a system should be no more than 10% of the size of the smallest feature being measured.
The "three sigma" rule - this rule states that if a measurement is within three standard deviations of the mean, it is considered statistically valid.
The "golden rule" - this rule states that the measuring instrument should be calibrated against a standard that is at least 10 times more accurate than the instrument being calibrated.
It is important to note that while metrology rules of thumb can be useful, they are not absolute and should not be relied upon exclusively. Proper measurement techniques and calibration procedures should always be followed to ensure accurate and reliable results.

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