Some technical terms about measurement:
    1Measurement: A set of operations performed to determine a quantity value.
    2Measured value: the quantity value obtained directly from the measuring instrument or through necessary calculation.
    3Accuracy of measurement: the degree to which the measured result is consistent with the agreed truth value being measured.
    4Repeatability of measurement: under the following conditions, continuous measurement of the same measured, the degree of consistency between the measurement results. The same measurement method; The same observer; The same measuring instrument; The same position; The same conditions of use; Repeat in short intervals.
    5Measurement reproducibility: change one or more of the following conditions, respectively, the same measured continuous measurement, the degree of consistency between the measurement results. Measurement method; An observer; Measuring instruments; Location; Conditions of use; Time.
    6Uncertainty of measurement: A rating that characterizes the range of magnitude in which the truth value being measured is located.
    7Absolute error of measurement: the difference between the measured result and the agreed truth value being measured.
    8Relative error: the ratio of the absolute error of the measurement to the true value being measured.
    9Random error: The component of a measurement error that changes unknowingly over the course of multiple measurements of the same being measured.
    10Systematic error: The component of measurement error that remains constant or changes in a predictable manner over multiple measurements of the same being measured.
    11Personnel error: the error caused by the subjective factors of the measuring personnel and operating techniques.
    12Environmental error: The component of measurement error that can vary with the environment.
    13Method error: error caused by imperfect measurement method.
    14Adjustment error: error caused by failure to adjust the measuring instrument or the measured object to the correct position or state.
    15Reading error: error caused by inaccurate reading of the measuring instrument by the observer.
    16Parallax: The error caused when the observer deviates from the correct observation direction for reading or aiming.
    17Read estimation error: error caused by reading estimation within the range of index values.
    18Gross error: error significantly exceeding the expected under specified conditions.
    19Measuring force: The measured pressure exerted by the measuring instrument on the measured surface (position) of the measured part.

    20Measuring instrument: An instrument that can be used, alone or in conjunction with other devices, to determine the value of a geometric quantity.

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