Sources of measurement error:
    (1Reference piece error: Any reference piece (such as a gauge block) has an error.
    (2Method error: caused by imperfect measurement methods.
    (3Measuring instrument error
    (4Adjustment error: Failure to adjust the measuring instrument or object to the correct position or state.
    (5Environmental error

    (6Personnel error: caused by subjective factors of measuring personnel and operating techniques.

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