Michigan Compiled Laws, Chapter 290. Weights, Measures and Standards § 290.620

Sec. 20. A county and 1 or more cities situated therein, with the consent of the director, may establish a joint weights and measures jurisdiction with 1 sealer and such deputy sealers, supervising inspectors, and city or county inspectors as may be required, under an agreement between the board of county supervisors and the city or cities involved. The sealer of the joint jurisdiction, and his deputy sealers, supervising inspectors, and city or county inspectors when acting under his instructions and at his direction, shall have the same powers and shall perform the same duties within the joint jurisdiction for which appointed as are granted to and imposed upon the director by this act.