This document specifies acceptance and periodic reverification tests of CMM performance with contacting probing systems and is only applicable to CMMs using: any type of contacting probing system, and spherical or hemispherical stylus tip(s). NOTE CMM probing performance tests are specified by the maximum permissible errors (MPEs), due to the impracticality of isolating the performance of the probing system from that of the CMM, even on a small artefact such as a test sphere. This document applies to CMMs supplied with any of the following: a) single-stylus probing system; b) multi-stylus probing systems with fixed multiple styli attached to a single probe (e.g. star stylus); c) multiple probing systems such as those with a stylus for each of their probes; d) systems with articulating probing systems; e) stylus and probe changing systems; f) manual (non-driven) as well as automated CMMs; g) installations including a scanning probe and capable of being used in a scanning measuring mode. This document is not applicable to non-contacting probing systems, which require different testing procedures. The terms multi-stylus size error , etc., should strictly be written combined CMM and multi-stylus probing- system size error , etc. For convenience, the wording has been truncated. If it is desired to isolate the probing-system performance as far as is practical, the influence of the CMM can be minimized but not eliminated. See Annex C for more information.