10Measurements to be ascertained in accordance with appropriate standards of measurement, Australian certified reference materials or certified measuring instruments

#### 10 Measurements to be ascertained in accordance with appropriate standards of measurement, Australian certified reference materials or certified measuring instruments When, for any legal purpose, it is necessary to ascertain whether a measurement of a physical quantity for which there are Australian legal units of measurement has been made or is being made in terms of those units, that fact shall be ascertained by means of, by reference to, by comparison with or by derivation from: (a) an appropriate Australian primary standard of measurement; (b) an appropriate Australian secondary standard of measurement; (c) an appropriate State primary standard of measurement; (d) an appropriate recognized‑value standard of measurement; (e) an appropriate reference standard of measurement; (f) 2 or more standards of measurement, each of which is a standard of measurement referred to in paragraph (a), (b), (c), (d) or (e); (g) an Australian certified reference material; (h) a certified measuring instrument; (i) one or more standards of measurement, each of which is a standard of measurement referred to in paragraph (a), (b), (c), (d) or (e) and an Australian certified reference material; (j) one or more standards of measurement, each of which is a standard of measurement referred to in paragraph (a), (b), (c), (d) or (e) and a certified measuring instrument; or (k) one or more standards of measurement, each of which is a standard of measurement referred to in paragraph (a), (b), (c), (d) or (e), an Australian certified reference material and a certified measuring instrument; and not in any other manner.