This part of ISO 13473 specifies requirements for profilometers used in pavement engineering in order to give meaningful and accurate measurement of pavement micro-, macro- and megatexture characteristics of paved road and airfield surfaces. It also includes schemes for the classification of such profilometers with respect to their use and overall accuracy. The profilometers may be of any operational type. The scope of this part of ISO 13473 does not include profile analysis of machined surfaces. Also excluded from the scope is the profile analysis of road unevenness. NOTE 1 Profile analysis of machined surfaces is dealt with in other standards, for example ISO 3274, ISO 4287, ISO 4288, ISO 5436-1, ISO 5436-2 and ISO 12085. NOTE 2 Profile analysis of road unevenness is dealt with in ISO 8608. NOTE 3 Throughout this part of ISO 13473, the use of the term "pavement" means "paved road or airfield surface".