(1) Weighing and measuring devices used by weighmasters must meet all legal requirements for commercial weighing and measuring devices.

(2) Weighmaster scales must be tested not less than every twelve months and must conform to the tolerances and specifications in the edition of NIST Handbook 44, "Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices," adopted by the department in chapter 16-662 WAC. Inspections must be performed by either service agents registered with the department or by the department. The department is under no obligation to provide this inspection service.

(3) A legible copy of the current scale inspection and current master business license must be maintained at the same site as the scale and must be immediately made available to the director or his representative upon request.