The following terms are used here and in literature elsewhere to discuss reference materials.

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There are currently 2 names in this directory beginning with the letter T.
The closeness of agreement between the average of an infinite number of replicate measured quantity values and a reference quantity value.
Tolerance Interval
A measure of homogeneity of one or more parameters in a reference material in which there is a fixed probability the specified interval will contain at least a specified proportion r of the population from which the sample is taken.