Mich. Comp. Laws § 290.103

Sec. 3. Reasonable variations shall be permitted and tolerance established by rules and regulations made by the director of the bureau of standards and approved by the secretary of commerce. Prosecutions for offenses under this act may be begun upon complaint of local sealers of weights and measures or other officer of the state appointed to enforce the laws of the said state, relating to weights and measures: Provided, however, That nothing in this act shall apply to barrels used in packing or shipping commodities sold exclusively by weight or numerical count.