The Measuring Equipment (Liquid Fuel delivered from Road Tankers) Regulations 1983

28.  Every dipstick used to measure deliveries of less than a full compartment shall be marked and graduated in accordance with the following provisions of this Regulation:—

(a) the graduation shall be in a reasonable and convenient scale;

(b) all scale marks, letters and figures shall be legibly and permanently marked;

(c) each scale mark shall be at right angles to the axis of the blade of the dipstick and shall extend across the full width of the dipstick;

(d) each scale mark shall be not less than 1 mm deep and not less than 1 mm nor more than 1.5 mm wide;

(e) the lower edge of each scale mark (the further edge from the datum face) shall indicate the quantity of liquid fuel being measured;

(f) each scale mark shall be numbered by figures not less than 6 mm high, with lines not less than 1 mm deep and not less than 1 mm nor more than 1.5 mm wide;

(g) the figures shall be placed immediately above the scale mark to which they relate and shall not extend above half way between the lower edges of two adjacent scale marks;

(h) the distance between the lower edges of two adjacent scale marks shall be not less than 18 mm and not more than 150 mm;

(i) major scale divisions shall be of equal value:

Provided that in the case of compartments the use of which commenced before 1st January 1981 one additional scale mark may be included to indicate the nominal capacity of the compartment; and

(j) the bottom two and top three major scale divisions may be subdivided with subdivisions of equal value.