(a) No device shall be approved unless it shall meet the specifications and tolerances prescribed in the National Bureau of Standards Handbook 44 as adopted by the commissioner, except that the basic maintenance and basic acceptance tolerance shall be two percent of the known test load.

(b) Whenever wheel-load weighers or portable axle-load scales are tested by the department, the Bureau of Weights and Measures shall prepare and maintain the records and prepare and issue the certificates prescribed in subdivisions (c) and (d) of this section. When two individual wheel-load weighers are marked as a pair, they shall be tested and certified as a pair, and tolerances shall be applied to the combined indications.

(c) The bureau shall record the name of the person or agency requesting such test, the serial numbers and type or model of each device tested, the date of and the result of such test and the person or persons performing such test, in a central register maintained in the bureau.

(d) In addition to the book of registry, the bureau shall prepare a certificate containing the information described in subdivision (c) of this section each time a device is tested. The original of such certificate shall be maintained in the bureau, and a duplicate original copy thereof shall be issued to the person or agency requesting such test.

(e) The bureau shall use the increasing-load test method in testing wheel-load weighers and portable axle-load scales. When using certified test weights, devices shall be verified at intervals not greater than 5,000 pounds. When using a force standard, the device shall be verified at a minimum of four test points between 7,500 pounds and capacity.