Sch 1B Pt 7 para 5
A random sample shall be taken from each lot according to the requirements of paragraph 5.3. All regulated measuring instruments in a sample shall be individually examined and appropriate tests set out in the relevant designated standard(s) and/or normative document(s), and/or equivalent tests set out in other relevant technical specifications, shall be carried out in order to verify their conformity with the type described in the type examination certificate and with the applicable requirements of these Regulations, and to determine whether the lot is accepted or rejected. In the absence of such designated standard or normative document, the approved body concerned shall decide on the appropriate tests to be carried out.