Regulation 25
Subject to paragraphs (2) and (3) of this regulation, any liquid capacity measure (other than a measure made of metal of a maximum purported value of half a gallon or less or 2½ litres or less) may be used for trade by means of any division or subdivision marked thereon as a capacity measures of any lesser quantity.
In the case of measures made of glass which are subdivided by graduations, the total number of graduations on the measure shall be marked thereon and all graduations shall be marked by clearly defined lines, which shall—
in the case of measures of a maximum purported value of 1 gallon or less (other than an apothecaries measure), be not less than 1 inch in length; and
be not less than one-twelfth of an inch apart.
In the case of measures made of metal which are subdivided by graduations, all graduations shall be marked by clearly defined lines and, if such measures are for use for the sale of milk and are—
of a maximum purported value not exceeding 5 gallons, the graduations shall be marked on two metal strips fixed opposite to each other inside the measure; or
of a maximum purported value exceeding 5 gallons, the graduations shall be marked either on a metal strip inside the measure and extending to the whole depth of the measure or on metal tablets securely soldered to the measure.