law: 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.