Wyo. Stat. § 40-10-121: Department of agriculture duties and powers.

(a) The department of agriculture shall perform the following functions:

(i) Assure that weights and measures in commercial service within the state are suitable for their intended use, properly installed and accurate, and are so maintained by their owner or user;

(ii) Prevent unfair or deceptive dealing by weight or measure in any commodity or service advertised, packaged, sold or purchased within this state;

(iii) Promote uniformity, to the extent practicable and desirable, between weights and measures requirements of this state and those of other states and federal agencies.

(b) Unless requested by the operator of the weighing or measuring equipment, the department shall have no authority over weights and measures used in activities subject to the authority of the United States department of the interior associated with on shore oil and gas, the United States federal energy regulatory commission, the Wyoming public service commission associated with pipelines and utilities or the Wyoming oil and gas conservation commission.

(c) Except as otherwise required by law, rule, regulation or third party agreement, the department shall have no authority over weights and measures used pursuant to a written agreement between the parties using the weighing device.