The sealer of weights and measures, before entering upon official duties, shall take the oath of office required by section 733.68 of the Revised Code. Except as otherwise provided in the municipal charter or in section 3.061 of the Revised Code, the sealer shall give bond to the municipal corporation in such amount as is prescribed by ordinance, with security to the approval of the mayor, and conditioned for the faithful performance of official duties. The sealer may appoint inspectors to assist the sealer in the sealer’s duties if authorized by the legislative authority.