Metrology laboratories. (1) Any State metrology laboratory currently approved by the NBS ongoing certification program having auditing capability is automatically approved by the Service.

Any county or city weights and measures jurisdiction approved by NBS or by their respective NBS-Certified State laboratory as being equipped with appropriate traceable standards and trained staff to provide valid calibration is approved by the Service. The State approval may be documented by a certificate or letter. The jurisdiction must be equipped to provide suitable certification documentation.

Any commercial industrial laboratory primarily involved in the business of sealing and calibrating test weights (standards) will be approved by the Service provided:

It requests written authority to perform tolerance testing of weights used within the Service's program(s) through their approved State jurisdiction. Copies of its request and written reference regarding the State decision shall be provided to the Service. A positive decision by the State will be required as a prerequisite to the Service's granting approval to any commercial laboratory to tolerance test the weights used in testing scales under the jurisdiction of the Service;

It has NBS traceable standards (through the State) and trained staff to perform calibrations in a manner prescribed by NBS and/or the State;

It is equipped to provide suitable certification documentation;

It permits the Service to make onsite visits to laboratory testing space.

Approval of the commercial industrial laboratory will be at the Service's discretion. Once it has obtained approval, the commercial industrial laboratory maintains its site in a manner prescribed by the State and the Service.

Type evaluation laboratories. Any State measurement laboratory currently certified by NBS in accordance with its program for the Certification of Capability of State Measurement Laboratories to conduct evaluations under the National Type Evaluation Program is approved by the Service.