This is the M2 Ruby Stylus #A-5004-0165. It features zirconia ball material.
Zirconia is a particularly tough ceramic material with hardness and wear characteristics approaching those of ruby. Its surface properties make it an ideal material for aggressive scanning applications on cast iron components.
| Thread mount (DG) | M2 |
| Overall length (L) | 10.00 mm |
| EWL (ML) | 4.5 mm |
| Stem diameter (DS) | 0.7 mm |
| Ball diameter (DK) | 1.5 mm |
| Ball material | Zirconia |
| Stem material | Stainless Steel |
| Holder material | Stainless steel |
| Center styli | N |
| Mass | 0.3 g |
