No person shall, himself or herself, or by a servant or agent, or as the servant or agent of any other person, advertise for sale any article of food in package form when the retail price is mentioned in such advertisement unless the actual weight or volume of the contents of such package as stated on the label shall be plainly and conspicuously set forth in such advertisement in not less than 5-point type.
Wis. Stat. § 100.184