Who Is N.I.S.T.?
In the UK
N.P.L. (National Physics Laboratory)
for instance carries out the task.
In the USA,
N.I.S.T. (National Institute
of Standards and Technology) carries out this task ensuring that via correct
calibration all similar instruments measure the same parameter producing the
same reading within their capabilities. The process is very similar to ensuring
that every choirboy sings from the same hymn sheet!