WAC 16-237-160

All scales used by warehouse operators and dealers must be certified for accuracy annually. Scale testing for certification may be performed by the department or by an approved scale company. When scales are tested by the department a seal shall be placed on the scales. The seal shall be dated and shall indicate approval or rejection. When scales are tested by an approved scale company, a copy of a scale test report shall be forwarded to the department and a copy shall be maintained in the warehouse operator's file.