law: Standards of Weights and Measures Act, 1976 
  18. Reference,
  
  secondary and working standards. – 
  (1) Every-
  (a)
  
  Reference standard,
  (b) Secondary
  
  standard, and
  (c)
  
  Working standard,
  Shall conform to the
  
  standards established by or under this Act and be verified and authenticated at
  
  such periodical intervals and in such manner as may be prescribed.
  (2) Every reference standard,
  
  every secondary standard and every working standard shall be kept in such
  
  manner and under such conditions as may be prescribed.