(a) at least the appropriate test proportion of the batch is tested by an inspector or licensee; and
(b) in each such test less than 2 per cent of the measures tested fail to comply with the requirements of section 13 of the Act for verification or certification.
(2) The appropriate test proportion of a batch of glass measures is the proportion determined by the administering authority from time to time.
(3) A batch of glass measures fails to comply with this regulation if the batch is not accompanied by a histogram detailing the results of tests made on the batch by or on behalf of the manufacturer or importer concerned.