This is a straight stylus that can be used for simple features with which direct contact can be made.
The stainless steel stem offers superior rigidity and is ideal for applications where weight is not an issue.
The ruby tip is very hard wearing and is ideal for most standard applications.
A silicon nitride tip is recommended if you are scanning aluminium as particles will not be deposited on the surface, unlike with ruby. Zirconia tips are more suitable for abrasive surafces, such as cast iron parts.

Renishaw M2 Ø3 mm ruby ball, stainless steel stem, L 10 mm, EWL 7 mm, A-5000-3604