Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 99, § 5

Every person who uses weights or measures of the metric system for the purpose of selling any goods, wares, merchandise or other commodities shall have them adjusted, sealed and recorded by an authorized sealer of weights and measures, and shall thereafter be responsible for the correctness and exactness of the same; and every person who illegally or fraudulently uses the metric weights or measures shall be liable to the same penalty to which he would have been liable if he had used other weights and measures.