The department may designate any competent employe or agent of the department and, upon satisfactory evidence of competency, may license any other person to make, upon request, investigations and classifications of farm products. When any such investigation and classification is made, the employe or agent shall issue a certificate of the grade or other classification of the farm product involved.

The department is authorized to fix, assess, and collect, or cause to be collected, fees for such services, when they are performed by employes or agents of the said department. Licensed agents may charge and collect as compensation for such services only such fees as may be approved by the department.

The department may suspend or revoke any license whenever, after opportunity for a hearing has been afforded to the licensee, the department shall determine that such licensee is incompetent, or has knowingly or carelessly failed to classify any farm product correctly, or has violated any provision of this act or of the regulations made hereunder. Pending investigation, the department may suspend a license temporarily without a hearing.