(1) Any weight or measure which conforms to the standard unit of such weight or measure and also conforms to such of the provisions of sections 15 to 19 (both inclusive) as are applicable to it shall be the standard weight or measure.
(2) Any numeral which conforms to the provisions of section 13 shall be the standard numeral.
Section 21 - Use of non-standard weight or measure prohibited
No weight, measure or numeral, other than the standard weight, measure or numeral, shall be used as a standard weight, measure or numeral.
Section 22 - Manufacture of non-standard weight or measure prohibited
No weight or measure shall be made or manufactured unless it conforms to the standards of weight or measure established by or under this Act:
Provided that the Central Government may permit the making or manufacturing of. any weight or measure which does not conform to the standards established by or under this Act, if such weight or measure is made or manufactured exclusively for the purpose of any scientific investigation or research or for export and is made or manufactured under such conditions and restrictions as may be prescribed.
Section 23 - Prohibition with regard to inscriptions etc
No weight, measure or other goods shall bear thereon any inscription or indication or weight, measure or number except in accordance with the standard unit of such weight, measure or numeration established by or under this Act:
Provided that in relation to any weight, measure or other goods which are manufactured for scientific investigation or research or for export, inscription or indication thereon of any weight, measure or number may also be made in accordance with any other system of weight, measure or numeration if such inscription or indication is demanded by the person by whom such scientific investigation or research is to be made or by the person to whom the export is to be made.