In each county, city, or town in which voting or counting equipment is to be used, the electoral board or general registrar may designate times and places for the exhibition of equipment containing sample ballots, showing the title of offices to be filled, and, so far as practicable, the names of the candidates to be voted for at the next election for the purpose of informing voters who request instruction on the use of the equipment. No equipment shall be used for such instruction after being prepared and sealed for use in any election. During exhibitions, the counting mechanism, if any, of the equipment may be concealed from view.