Prior to using a voting machine or punch card voting system and during the first two years of use, one or more of the voting machines or punch card voting devices shall be placed on public exhibition with a ballot in place and shall be attended by a competent person for the instruction of the registered voters of the precinct in its proper use. At least one mechanical instruction model voting machine or punch card voting device shall be available for the instruction of registered voters at each polling place during any election in which such machines or devices are being used. The mechanical instruction model shall be capable of being operated in the same manner as the official voting machines or punch card voting devices. The mechanical instruction model shall be attended at all times by a judge or clerk of election to instruct registered voters requiring instruction in the correct operation of the machine or device.