law: Standards of Weights and Measures Act, 1976 
  39. Quantities and
  
  origin of commodities in packaged form to  be declared. -
  (1) No person
  
  shall-
  (a)
  
  Make, manufacture, pack, sell, or cause to be packed or sold; or
  (b)
  
  Distribute, deliver, or cause to be distributed or delivered, or
  (c)
  
  Offer, expose or possess for sale,
  Any commodity in
  
  packaged form to which this part applies unless such package bears thereon or
  
  on label securely attached thereto a definite, plain and conspicuous
  
  declaration, made in the prescribed manner, of-
  (i) The identity of
  
  the commodity in the package
  (ii) The net quantity,
  
  in terms of the standard unit of weight or measure, of the commodity in the
  
  package
  (iii) Where the
  
  commodity is packaged or sold by number, the accurate number of the commodity
  
  contained in the package,
  (iv) The unit sale
  
  price of the commodity in the package; and
  (v) The sale price of
  
  the package.
  Explanation- In this sub-section,
  
  the expression “unit sale price” means the price according to such unit of
  
  weight, measure or number as may be prescribed.
  (2) Every package to
  
  which this Part applies shall bear thereon the name of the manufacturer and
  
  also of the packer or distributor.
  (3) Where the package
  
  of a commodity to which this Part applies or the label thereon bears a
  
  representation as to the number of servings, of the commodity contained
  
  therein, such package or label shall also bear a statement as to the net
  
  quantity (in terms of weight, measure or number) of each such serving.
  (4) The statement on a
  
  package or label as to the net weight, measure or number or the contents
  
  thereof shall not include any expression which tends to qualify such weight,
  
  measure or number:
  Provided that the Central
  
  Government may, by rules, specify the commodities, the weight or measure of
  
  which is likely to increase or decrease beyond the prescribed tolerance limits
  
  by reason of climatic variations; and it shall be lawful for the manufacturer
  
  or packer of the commodity so specified to qualify the statement as to the net
  
  content of such commodity by the use of the words “when packed”.
  Explanation.- The words “when
  
  packed” shall not be used in any case except a case to which the proviso to
  
  sub-section (4) applies.
  (5) Where the Central
  
  Government has reason to believe that there is undue proliferation of weight,
  
  measure or number in which any commodity is, or reasonably comparable
  
  commodities are, being packaged for sale, distribution or delivery and such
  
  undue proliferation impairs in the opinion of that Government, the reasonable
  
  ability of the consumer to make a comparative assessment of the prices after
  
  considering the net quantity or number of such commodity, that Government may
  
  direct the manufacturers and also packers or distributors to sell, distribute
  
  or deliver such commodity in such standard quantities or number as may be
  
  prescribed.
  (6) Whenever the
  
  retail price of a commodity in packaged form to which this chapter applies is
  
  stated in any advertisement there shall be included in the advertisement, a
  
  conspicuous declaration as to the net quantity or number of the commodity
  
  contained in the package and retail unit sale price thereof.
  (7) No person shall
  
  sell, distribute or deliver for sale a package containing a commodity which is
  
  filled less than the prescribed capacity of such package except where it is
  
  proved by such person that the package was so filled with a view to-
  (a)
  
  Giving protection to the contents of such package, or
  (b)
  
  Meeting the requirements of machines used for enclosing the contents of such
  
  package.
  (8) The Central
  
  Government may, by rules, specify such reasonable variations in the net
  
  contents of the commodity in a package as may be caused by the method of
  
  packing or the ordinary exposure which may be undergone by such commodity after
  
  it has been introduced in trade or commerce.
  (9) The Central
  
  Government may, by rules, specify the classes of commodities of packages in
  
  relation to which all or any of the provisions of this section shall not apply
  
  or shall apply with such exceptions or modifications as may be specified
  
  therein.