7.—(1) Capacity serving measures may be either —
(a)brim measures, which shall have a plane rim and be of a nominal capacity in column 1 of Table 1 in the Schedule to these Regulations; or
(b)line measures, which shall be of a nominal capacity in column 1 of Table 2 in the Schedule to these Regulations and marked with a line which shall be —
(i)on the inside or outside surface of the measure;
(ii)conspicuous and durable;
(iii)of a thickness of not less than 0.5 mm and not more than 1.5 mm;
(iv)subject to paragraph (2) below, of a minimum length as set out in column 5 of the said Table 2 for a measure of the relevant capacity; and
(v)at a minimum vertical distance from the top of the line to the plane of the brim as set out in column 3 of the said Table 2 for that measure, and at a maximum vertical distance from the top of the line to the plane of the brim of four times the relevant minimum distance.
(2) Where the minimum length of line referred to in paragraph 1(b)(iv) above is 25 mm, a line measure may instead be marked with two equal co-linear lines which, together with a separation of 2 mm, total not less than 25 mm.