California Code, Business and Professions Code - BPC § 12309

The department shall, at the request of the legislative body of any county, furnish copies of the standard weights and measures of the State at the expense of the county requesting them.  It shall upon request of the legislative body of any county or upon the request of a sealer of any such county test and approve copies of the State's standards of weights and measures procured by such county to be used by a county sealer.

Copies furnished under the provisions of this section or copies tested and approved shall be true and correct;  shall be sealed and certified to;  and stamped with the letter “C.”  Such copies need not be of the same material or construction as the standards of the State and such copies may be furnished in any suitable materials or construction that the county requiring the same may specify, subject to the approval of the department.