law: Standards of Weights and Measures Act, 1976 
  24. Supply, etc. of
  
  reference standards . –
  (1) The Central
  
  Government shall cause to be prepared, for -the purposes of this Act, as many
  
  sets of reference standards as it may think necessary and shall supply to each
  
  State Government as many sets of reference standards as it may think fit.
  (2) The Central
  
  Government shall keep in its custody, for the purposes of this Act, such number
  
  of  reference standards as may be necessary.
  (3) Every reference
  
  standard referred to in sub-section (2) shall be kept at such place and in such
  
  custody as may be prescribed and no such reference standard shall be deemed to
  
  be a reference standard and shall be used as such unless it has been verified
  
  and authenticated in accordance with the rules made under this Act.