10. Use of weights only or measures only or number only in certain cases.

(a) Weight, 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;
(e) Number, if the commodity is sold by number.