All fluid dairy products, including whole milk, skimmed milk, cultured milk, sweet cream, and buttermilk shall be sold by fluid volume. Cottage cheese, cottage cheese products, sour cream, and yogurt shall be sold by weight. Ice cream, ice milk, French ice cream, French custard ice cream, frozen custard, frozen dietary dairy dessert, frozen yogurt, mellorine, parevine, sherbert, water ice, fruit ice, dietary frozen dessert, quiescently frozen confection, or quiescently frozen dairy confection, and any products which are similar in appearance, odor, or taste to such products or are prepared or frozen as such products are customarily prepared or frozen, whether made with dairy products or nondairy products, together with the mixes used in such products and for which a standard has been promulgated by the Secretary of Health, shall be kept, offered, and exposed for sale and sold by fluid volume. Frozen yogurt shall be sold or offered for sale by weight, whether or not combined with other condiments, if the amount of the frozen yogurt to be purchased is: Determined by the purchaser; and Dispensed by the purchaser. If hand dipped, any of the items listed in subsection (c) of this section may be sold by weight, fluid volume, or the serving.