Cal. Bus. & Prof. Code § 12655
It is the intent of the Legislature to encourage the unit pricing of all canned, bottled, and packaged foods, packaged produce, and bakery goods; paper, plastic, wood, and metal products packaged in counts greater than 10; rolled paper, plastic, and metal products; canned, bottled, and packaged domestic, laundry and household cleansing, finishing, waxing, and polishing products; drug and first aid products canned, packaged, or bottled in counts greater than 10; and frozen fruits and vegetables, offered by merchants in their places of business for sale at retail to the public. The Legislature finds that unit pricing, the price per ounce, per pound, per gallon, or the metric equivalent thereof, or per 100 square feet, or per 100 count, for which those items are offered for sale at retail, effectively informs the consumer of the comparative prices and values of commodities, and is thus useful for the formulation of intelligent consumer choices. Reconstituted fluid ounce is the preferred unit of measure for unit pricing of powdered and concentrated infant formula.
Ca. Bus. and Prof'l. Code § 12655