law: Standards of Weights and Measures Act, 1976 
  26. Verification,
  
  stamping, etc. of secondary or working  standards. -
  (l) Every secondary
  
  standard referred to in Sec. 25 shall be verified with the reference standard
  
  by such authority as may be prescribed and shall, if found on such verification
  
  to conform to the standards established by or under this Act, be stamped by
  
  that authority.
  (2) Every working
  
  standard referred to in Sec. 25 shall be verified with the secondary standard which
  
  has been stamped in accordance with the provisions of sub-section (1), by such
  
  authority as may be prescribed and shall, if found on such verification to
  
  conform to the standards established by or under this Act, be stamped by that
  
  authority.
  (3) Where any
  
  secondary standard or working standard is stamped in accordance with the
  
  provisions of sub-section (1) or sub-section (2), as the case may be, a
  
  certificate shall be separately given showing the date on which such weight or
  
  measure was stamped.
  (4) Every secondary
  
  standard or working standard which is not verified and stamped in accordance
  
  with the provisions of sub-section (1) or sub-section (2), as the case may be,
  
  shall not be deemed to be a secondary standard or working standard and shall not
  
  be used as such.