California Code, Business and Professions Code - BPC § 12210.5

(a) Any county which inspects or tests any weighing or measuring device or instrument used commercially, at the request of the owner or user of that device, when inspection or testing of the device could legally be performed by a registered service agency, as defined in Section 12531, may, if authorized by the county board of supervisors, collect from the requesting owner or user thereof a fee.

(b) That fee shall be based upon a uniform schedule of fees, which shall be prescribed by the secretary for use by the counties. The secretary shall prepare the schedule of fees to be comparable with the rates charged by the industry's registered service agencies. All fees collected shall be credited to the general fund of the county in which collected and used only for the administration and enforcement of laws pertaining to weights and measures.