OIML guidance to clause 1 (G.1-1 to G.1-3) G.1-1 “Certification bodies” are national issuing authorities and OIML Issuing Authorities under the OIML-CS. G.1-2 “Third-party conformity assessment” is national type approval and issuing OIML Certificates. G.1-3 The word “product” shall be understood as meaning the measuring instrument type (including families of measuring instruments, modules, or families of modules) subject to national type approval or issuing OIML Certificates. Processes and services are not relevant to national type approval and issuing OIML Certificates.