Section 12(2) in The Legal Metrology (Packaged Commodities) Rules, 2011
(2)Except in the cases of commodities specified in the Fourth Schedule, the declaration of quantity shall be in terms of the unit of -(a)mass, if the commodity is solid, semi-solid, viscous or a mixture of solid and liquid;(b)length, if the commodity is sold by linear measure;(c)area, if the commodity is sold by area measure;(d)volume, if the commodity is liquid or is sold by cubic measure; or(e)number, if the commodity is sold by number:
