Categories of capacity measures
4. For the purposes of these Regulations, a capacity measure is either—
(a)a line measure marked with lines which—
(i)are conspicuous and durable, and
(ii)are marked on the outside surface of a measure which is made of transparent or translucent material and on the inside surface of a measure which is made of opaque material; or
(b)a brim measure having a brim in a horizontal plane when the measure is on a flat, horizontal surface.