The administrator shall investigate complaints deemed appropriate and advisable to develop information on prevailing procedures in commercial quantity determination and on possible violations of this chapter and to promote the general objective of accuracy in the determination and representation of quantity in commercial transactions. In the course of any investigation, the administrator is empowered to subpoena witnesses, examine them under oath, and require the production of books, papers, documents, records, or objects which the administrator deems relevant or material to the inquiry. Upon application by the administrator, compliance with the subpoena may be enforced by the circuit court in the county where the person subpoenaed resides or is found in the same manner as a subpoena issued by the clerk of a circuit court. In addition, the administrator may conduct hearings in aid of any investigation or inquiry.