(a) The regulatory authority may examine and test any meter, instrument, or equipment used for the measurement of service of any utility and may enter any premises occupied by any utility for the purpose of making the examinations and tests and exercising any power provided for in this chapter and may set up and use on those premises any apparatus and appliances necessary for those purposes. The utility may be represented at the making of the examinations, tests, and inspections.
(b) The utility and its officers and employees shall facilitate the examinations, tests, and inspections by giving every reasonable aid to the regulatory authority and any person or persons designated by the regulatory authority for those duties.

(c) Any consumer or user may have a meter or measuring device tested by the utility once without charge after a reasonable period to be fixed by the regulatory authority by rule and at shorter intervals on payment of reasonable fees fixed by the regulatory authority. The regulatory authority shall declare and establish reasonable fees to be paid for other examining and testing of those meters and other measuring devices on the request of the consumer.
(d) If the test is requested to be made within the period of presumed accuracy as fixed by the regulatory authority since the last test of the same meter or other measuring device, the fee to be paid by the consumer or user at the time of his request shall be refunded to the consumer or user if the meter or measuring device is found unreasonably defective or incorrect to the substantial disadvantage of the consumer or user. If the consumer’s request is made at a time beyond the period of presumed accuracy fixed by the regulatory authority since the last test of the same meter or measuring device, the utility shall make the test without charge to the consumer or user.