(a) A city may appoint a sealer of weights and measures, and the deputy sealers of weights and measures it needs. If the city appoints a sealer, it shall obtain at its expense the standards of weights and measures and the additional equipment, for use in the enforcement of this chapter in the city, that the director prescribes.
(b) When the standards of weight and measure provided by a city are examined and approved by the director, they are the official standards for the city. At least every five years, the sealer shall make or arrange to have made comparisons between the field standards and appropriate standards of a higher order belonging to the city or to the state, in order to maintain the field standards in accurate condition.