Any licensed weighmaster or deputy weighmaster who falsifies a weight certificate, or who delegates his authority to any person not licensed as a weighmaster or deputy weighmaster, or who signs a weight certificate with his official signature before performing the act of weighing, shall be guilty of a misdemeanor. Upon conviction he shall be punished by a fine of not less than fifty dollars ($50.00) nor more than five hundred dollars ($500), or by imprisonment for not less than thirty days nor more than ninety days, or by both the fine and imprisonment.