element that consists of a nominally right circular cone of defined cone angle and of a nominally spherical tip of defined radius, physical element that establishes the contact with the workpiece, element, mis loob kontakti mõõteobjektiga, varb-/nõelotsaku element, mis koosneb kindla koonusenurgaga ümarkoonuse kujulisest osast ja sfäärilisest, kindla raadiusega tipust