This document specifies the general requirements, terms and definitions of characteristics of GPS measuring equipment, e.g. micrometers, callipers, gauge blocks, and rotary axis form measuring instruments. Some measuring equipment, e.g. coordinate measuring systems, are covered in other standards, but the requirements, terms and definitions given in this document may be applicable. This document forms the basis for standards defining and describing the design characteristics and metrological characteristics for measuring equipment and gives guidance for the development and content of standards for GPS measuring equipment. This document is intended to ease the communication between manufacturer/supplier and customer/user and to make the specification phase of GPS measuring equipment more accurate. This document is also intended as a tool to be used in companies in the process of defining and selecting relevant characteristics for measuring equipment. This document includes terms which are frequently used in connection with the characterization of specific measuring equipment.