15.—(1) An inspector may open any locked or sealed tank or container for the purpose of testing any measuring equipment or the return of test liquid withdrawn during testing.
(2) Upon the conclusion of the test, any test liquid so withdrawn shall forthwith be—
(a)returned to the tank or container from which it was withdrawn if the inspector is of the opinion that it is practicable and desirable so to do and the proprietor or person in charge of the equipment does not object; or
(b)placed in another suitable receptacle reasonably convenient for the purpose and nominated and provided by the proprietor or person in charge of the equipment.
(3) The inspector, if requested, shall give to the proprietor or person in charge of the said equipment a signed and dated statement of the quantity of such test liquid withdrawn from the tank or container and returned or placed as aforesaid.