Cal. Pen. Code § 381a
Any person, or persons, whether as principals, agents, managers, or otherwise, who buy or sell dairy products, or deal in milk, cream or butter, and who buy or sell the same upon the basis of their richness or weight or the percentage of cream, or butter-fat contained therein, who use any apparatus, test bottle or other appliance, or who use the "Babcock test" or machine of like character for testing such dairy products, cream or butter, which is not accurate and correct, or which gives wrong or false percentages, or which is calculated in any way to defraud or injure the person with whom he deals, is guilty of a misdemeanor, and upon conviction shall be fined not more than one thousand dollars ($1,000) or imprisoned in the county jail not more than six (6) months.
Ca. Pen. Code § 381a