Section 13(3) in The Standards of Weights and Measures (Packaged Commodities) Rules, 1977
(3)When expressing a quantity of equal to or more than-(a)one kilogram, the unit of weight shall be the kilogram and any fraction of a kilogram shall be expressed in terms of decimal sub-multiples of kilogram or in terms of grams;(b)one metre, the unit of length shall be the metre and any fraction of a metre shall be expressed in terms of decimal sub-multiples of the metre or in terms of centimetre;(c)square metre, the unit of the area shall be the square metre and any fraction of a square metre shall be expressed in terms of decimal sub-multiple of the square metre;(d)cubic metre, the unit of volume shall be the cubic metre and any fraction of a cubic metre shall be expressed in terms of decimal sub-multiple of the cubic metre;(e)one litre, the unit of volume shall be the litre and any fraction of a litre shall be expressed in terms of decimal sub-multiple of the litre:Provided that where the quantity to be expressed is equal to one kilogram, one metre, one square metre, one cubic decimetre, one cubic metre or one litre, as the case may be, such quantity may be expressed at the option of the manufacturer or the packer, as the case may be, in terms of gram, centimetre, square decimetre, cubic centimetre, cubic decimetre or millimetre, as the case may be.
