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It is used, along with significant digits, to indicate the precision of a measurement. Thus, in the two-significant-digit measurement 5.4 0.2 meters, the uncertainty interval is 0.2 meters. This means that the true value of the measurement is believed to lie between 5.2 meters and 5.6 meters.
This definition builds upon the basic definition of calibration by clarifying that the measurement standards used in calibration must be of known uncertainty (amount of possible error). In other words, the known value must have a clearly understood uncertainty to help the instrument owner or user determine if the measurement uncertainty is appropriate for the calibration.