From the point of view of metrology, uncertainty is defined as the characteristic associated with the result of a measurement, which defines bidirectional space centered on the value offered by the measuring instrument, within which a certain statistical probability lies with the value Measured.
This type of uncertainty is calculated by the calibration, obtaining statistical data from a series of comparisons of the calibrated measuring instrument against a reference standard with known nominal and uncertainty, which provides demonstrable document traceability to internationally accepted measurement standards.
The expression of the measure of any magnitude should not be considered complete if it does not include the assessment of uncertainty associated with its measurement process.