law: Standards of Weights and Measures (Enforcement) Act, 1985
  22. Prohibition of
  
  sale or use of unstamped weights or measures.-
  No weight or measure
  
  shall be sold, or offered, exposed or possessed for sale, or used or kept for
  
  use in any transaction or for industrial production or for protection unless it
  
  has been verified and stamped:
  Provided that 
  
  nothing in this section shall apply to any weight or measure which has been
  
  initially verified and stamped with a special seal referred to in sub-section
  
  (3) of section 41 of the Standards Act.