law: Standards of Weights and Measures (Enforcement) Act, 1985
  Chapter VII:
  
  Verification and Stamping of Weights or Measures
  24. Verification and
  
  stamping of weights or measures.-
  1.  Every
  
  person having any weight or measure in his possession, custody or control in
  
  circumstances indicating that such weight or measure is being, or is intended
  
  or likely to be, used by him in any transaction or for industrial production or
  
  for protection, shall, before putting such weight or measure into such use,
  
  have such weight or measure verified at such place and during such hours as the
  
  Controller may, by general or special order, specify in this behalf
  
  (hereinafter referred to as the specified place or specified time), on payment
  
  of such fees as may be prescribed.
  2.  Every
  
  weight or measure referred to in sub-section (1) shall be re-verified at such
  
  periodical intervals as may be prescribed.
  Explanation.-- For the removal of
  
  doubts it is hereby declared that no periodical re-verification shall be
  
  necessary in relation to any weight or measure which is used exclusively for
  
  domestic purposes.
  1.  
  2.  
  3.  Every
  
  Inspector shall, for the purpose of verification of any weight or measure,
  
  attend the specified place (within the local limits of his jurisdiction) at the
  
  specified time and verify every weight or measure which is brought to him at
  
  such place and within such time and shall, if he is satisfied that such weight
  
  or measure conforms to the standards established by or under the Standards Act,
  
  put his stamp thereon:
  Provided that where any weight or
  
  measure is such that it cannot, or should not, be moved from its location, the
  
  Inspector shall take such steps for the verification of such weight or measure
  
  at the place of its location as may be prescribed.
  4.    Where
  
  any verification has been made under sub-section (3), the Inspector shall grant
  
  to the person referred to in sub-section (1) a certificate in the prescribed
  
  form indicating therein the particulars of the weight or measure verified and
  
  stamped by him.
  5. Where
  
  the Controller is of opinion that by reason of the size of nature of any weight
  
  or measure, it is not desirable or practicable to put a stamp thereon, he may,
  
  by an order in writing, direct that instead of putting a stamp on such weight
  
  or measure, a certificate may be issued to the effect that such weight or
  
  measure conforms to the standards established by or under the Standards Act and
  
  every weight or measure so certified shall be deemed to have been duly verified
  
  and stamped under this Act on the date on which such certificate was issued.
  6. 
  
    Every
  
  certificate referred to in sub-section (5) shall be in such form as may be
  
  prescribed and shall contain such details as to enable a clear identification
  
  of the weight or measure to which it relates.