law: Standards of Weights and Measures Act, 1976 
  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.