The commissioner may adopt rules for determining the qualifications of the applicant for a license as a licensed public weigher. He may pass upon the qualifications of the applicant upon the basis of the information supplied in the application, or he may examine such applicant orally or in writing, or both, for the purpose of determining his qualifications. He shall grant licenses as licensed public weighers to such applicants as may be found to possess the qualifications required by section 43-16c. The commissioner shall keep a record of all such applications and of all licenses issued thereon.