4. The regulation of specifications, construction, placing on the market and use of articles, instruments, containers or other equipment intended for weighing, measuring or testing or for purposes ancillary thereto, including, in particular—
(a)approval of patterns and the verification of conformity with patterns or other requirements;
(b)authentication and proof of such approval or verification or of exemption from the need for approval or verification;
(c)supervision and enforcement of compliance with requirements(1).