N.D. Cent. Code § 64-02-13
The commission may test or calibrate weighing or measuring devices. The owner of any weighing or measuring device used in this state is responsible for its accuracy and condition. The public service commission shall determine the frequency of required testing for each category of weighing and measuring device, which may not exceed twenty-four months. If upon testing the weighing or measuring device is within the permitted tolerance, it must be sealed. Inspections and testing of farm milk bulk tank equipment may be made only by the state dairy department under section 4.1-25-26. Inspections and testing of oil and gas production meters and measuring devices may be made only by or under the direction of the industrial commission under section 38-08-04. If upon complaint the commission finds the weighing or measuring device is within the permitted tolerance, the cost of the test, unless waived by the commission, must be paid by the complainant and in all other cases the cost of testing must be paid by the owner of the equipment.
N.D.C.C. § 64-02-13