The exhaust opacity measurement shall be conducted using an opacity meter approved by the department.
The opacity meter shall:
(1) Automatically calibrates itself before each test.
(2) Provide for continuous measurement of exhaust opacity unaffected by rain or wind.
[Statutory Authority: Chapter
70.120 RCW. WSR 94-05-039 (Order 93-10), § 173-422-095, filed 2/8/94, effective 3/11/94; WSR 93-10-062 (Order 91-46), § 173-422-095, filed 5/3/93, effective 6/3/93.]