California Code, Business and Professions Code - BPC § 12209

(a) Carefully preserve all copies of the standards of weights and measures in his possession;

(b) Keep the copies in a safe and suitable place when not actually in use;

(c) Annually and at such other times as the department requires file with the department a written report of the work done by him, of the weights, measures, weighing and measuring instruments inspected or tested by him, the result of such inspection, of all prosecutions instituted by him for violations of the provisions of this division and of all other matters and things pertaining to his duties or which may be required by the department.