Standards of Weights and Measures Act, 1976
23. Prohibition with regard to inscriptions, etc.-
No weight, measure or other goods shall bear thereon any inscription or indication of 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.