The Standards of Weights and Measures (Enforcement) Act,1985
Section 9. Prohibition of use of weights and measures other than standard weights and measures
(1) Notwithstanding any custom, usage or method of whatever nature, no weight or measure, other than the standard weight or measure, shall be used or kept in any premises in such circumstances as to indicate that such weight or measure is intended, or is likely to be used, for any weighment or measurement.
(2) On and from the commencement of this Act, no weight, measure or number, other than the standard weight or measure shall be used in, or form the basis of, any contract or other agreement in relation to any trade, commerce, production or protection.
(3) Any contract or other agreement, which contravenes the provisions of sub-section (2), shall be void.