(a) A commodity in liquid form shall be sold only by liquid measure or by weight, except as otherwise provided in this title. A commodity not in liquid form may be sold only by weight, dry measure, length, area, or count. However, a liquid commodity may be sold by weight and a commodity not in liquid form may be sold by count only if these methods give accurate information as to the quantity of commodity sold.
(b) The provisions of this section do not apply to:
(1) Any commodity sold for immediate consumption on the premises where sold;
(2) Vegetables when sold by the head or bunch;
(3) Any commodity in a container standardized by a law of the State or by federal law;
(4) Any commodity in package form when there exists a general consumer usage to express the quantity in some other manner;
(5) Any concrete aggregate, concrete mixture, and loose solid material, such as earth, soil, gravel, crushed stone, and similar materials, when sold by cubic measure; or
(6) Unprocessed vegetable and animal fertilizer when sold by cubic measure.
(c) The Secretary may adopt any reasonable rules and regulations necessary to assure that any amount of commodity sold is determined according to good commercial practice and is determined and represented to be accurate and informative to all interested parties.