law: The Legal Metrology Act, 2009
  9. Reference,
  
  secondary and working standard. -
  1.  The
  
  reference standards, secondary standards and working standards of weights and
  
  measures shall be such as may be prescribed.
  2.  Every
  
  reference standard, secondary standard and working standard shall be verified
  
  and stamped in such manner and after payment of such fee as may be prescribed.
  3.  Every
  
  reference standard, secondary standard and working standard which is not
  
  verified and stamped in accordance with the provisions of sub-section (2) shall
  
  not be deemed to be a valid standard.