Section 157.12e - Certificate of approval(a) A copy of the certificate of approval for the oil content meters must be carried aboard an oil tanker fitted with such equipment at all times.(b) A certificate of type approval must be issued for the specific application for which the oil content meter is approved, that is, for crude oil, "black" products, "white" products, or other products or applications as listed on the certificate.USCG-2004-18939, 74 FR 3379 , Jan. 16, 2009