(a) be provided either as a separate standard or by
means of divisions marked on a standard of larger
measure; and
(b) either be marked in whole or in part with
subdivisions representing any smaller unit of
measurement or multiples, submultiples or
fractions of such a unit or have no such markings.
(3) The reference standards shall be in the custody
of the Director of Industry or the Government Chemist who
shall lodge them at a Government laboratory.