California Code, Business and Professions Code - BPC § 12540

(a) Commencing on January 1, 2001, no person shall be employed by a service agency as a service agent unless he or she possesses a current license.

(b) Commencing on January 1, 2001, applicants for a service agent license shall pass a written examination on the laws and regulations governing weights and measures.  A passing score of 70 percent or greater is required to qualify for a license pursuant to this chapter.  Examinations developed by the department may be taken by appointment in any county sealer's office or at a location designated by the Division of Measurement Standards.

(c) An application for the examination to obtain a service agent license shall be in a form prescribed by the department and shall be accompanied by a fee established by the secretary to recover costs of examination administration, payable to the county in which the examination is given, or to the Division of Measurement Standards, if the examination is given by the department.

(d) Every service agent shall be reexamined every five years.  To maintain a service agent license, the reexamination shall be taken and passed on or before the date on which the examination was last taken and passed.