This is the M4 ruby stylus #A-5003-5728.
Straight styli are designed to inspect simple features where direct, unobstructed contact with a measured surface is possible. A stainless steel stem offers excellent rigidity and is ideal for applications where weight is not critical. Silicon nitride tips are recommended when scanning aluminum because particles will not be deposited on the surface.
|Thread mount (DG)
|Ball Diameter (DK)
|Stem Diameter (DS)