(1) A weight or measure other than a weight or measure of an authorised denomination specified in Part 1 or Part 2 of Schedule 3 shall not be used for the purposes of any trade.
(2) Subject to subsection (3), a person shall not use for the purposes of any trade, or have in his or her possession for use in any trade—
(a) any weight which purports to be of an authorised denomination, unless the denomination is indelibly marked on the top or side of it in legible figures and letters;
(b) any measure of length or volume which purports to be of a denomination equivalent to an authorised denomination unless the denomination is marked indelibly on the outside of it in legible figures and letters.
(3) Nothing in this section shall be considered to require the marking of a denomination of any weight, if the small size of such weight renders such marking impracticable.