It shall be unlawful to install a scale, used for commercial purposes in this state, unless the scale is so installed that it is easily accessible for inspection and testing by equipment of the department and with due regard to the scale’s size and capacity. Every scale manufacturer or dealer shall, upon selling a scale of the above types in Iowa, submit to the department upon forms provided by the department, the make, capacity of the scale, the date of sale, and the date and location of its installation.