N.M. Stat. § 62-6-22
Any consumer or user may have any meter or measuring device tested by the utility once without charge after a reasonable period to be fixed by the commission by rule, and at shorter intervals upon payment of reasonable fees fixed by the commission. The commission shall declare and establish reasonable fees to be paid for other examining and testing [of] such meters and other measuring devices on the request of the consumer. If the test is requested to be made within the period of presumed accuracy as fixed by the commission since the last such 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 be 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 commission since the last such test of the same meter or measuring device, the utility shall make the test without charge to the consumer or user.
NMS § 62-6-22