law: Standards of Weights and Measures Act, 1976 
  16. National
  
  standards. – 
  (l) For the
  
  purpose of deriving the value of the base units, other than the base unit of
  
  mass, the Central Government shall cause to be prepared such objects or equipments,
  
  or both, as may be necessary for the purpose and shall cause the accuracy of
  
  such objects or equipments, or both, to be certified by the International
  
  Bureau of Weights and Measures at such periodical intervals as may be
  
  prescribed, and, shall, after such certification deposit such objects or
  
  equipments, or both, in such custody and at such place as that Government may
  
  think fit.
  (2) For the purpose of
  
  deriving the value of the supplementary and other units specified under Sec.
  
  12, the Central Government shall cause to be prepared such objects or
  
  equipments, or both as may be necessary for the purposes and shall cause the
  
  accuracy of such objects or equipments, or both, to be certified at such
  
  periodical intervals and by such authority as may be prescribed, and, shall,
  
  after certification, deposit such objects or equipments, or both, in such
  
  custody and at such place as that Government may think fit.