The commissioner, with the approval of the Board of Agriculture and Industries, may establish official stations for the inspection of grain at any town or place where grain is bought, sold, marketed, stored or manufactured. The commissioner shall inspect and grade upon request all grain sold, offered for sale or consigned for sale. He shall issue a uniform grade certificate stating the kind and grade of grain, test weight per bushel and the reason for all grade below number one and such other facts as he may require. None of the facts certified in such certificate shall be presumed to continue or exist beyond 60 days after the date of such certificate. Certificates issued by authorized agents of the commissioner shall be received in all courts of the State of Alabama as prima facie evidence of the truth of the statements therein contained at the time of the issuance of said certificate and for 60 days thereafter. Such certificates shall be delivered to the owner of such grain or his agent.