law: Standards of Weights and Measures (Enforcement) Act, 1985
  14. Verification,
  
  stamping and custody of secondary or working standards.-
  1.  Every
  
  secondary standard or working standard referred to in section 13, shall conform
  
  to the standards established by or under the Standards Act and shall be
  
  verified--
  a.   in the case of a
  
  secondary standard, at any one of the places where reference standards are
  
  maintained, against the appropriate reference standard;
  b.   in the case of a
  
  working standard, at any one of the places where secondary standards are
  
  maintained, against the appropriate secondary standard, in such manner and at
  
  such periodical intervals as may be specified by or under the Standards Act and
  
  shall, if found on such verification to conform to the standards established by
  
  or under that Act, be stamped.
  1.  
  2.  Where
  
  any secondary standard or working standard is stamped under sub-section (1), a
  
  certificate shall be separately issued showing the date on which such weight or
  
  measure was stamped.
  3.  Every
  
  verification and stamping referred to in sub-section (1) shall be made by such
  
  person or authority as may be specified by or under the Standards Act.
  4.    A
  
  secondary standard or working standard which is not verified and stamped in
  
  accordance with the provisions of sub-section (1) and sub-section (3) shall not
  
  be deemed to be a secondary standard or working standard, as the case may be,
  
  and shall not be used for the verification of any working standard or, as the
  
  case may be, for the verification of any weight or measure.
  5. Every
  
  verified secondary standard and every verified working standard shall be kept
  
  at such place and in such custody as may be prescribed.