This is the M3 tungsten carbide styli for Zeiss #A-5555-0273. It has a stainless steel base, tungsten carbide stem and ruby ball.
| Styli | M3 |
| Ball Diameter (DK) | 0.3 mm |
| Length (L) | 22.0 mm |
| Base Diameter (DG) | 4.0 mm |
| EWL (ML/ML1) | 9.0 mm/ 2.3 mm |
| Stem Diameter (DS/DS1) | 1.0 mm/ .02 mm |
| Stem material | Tungsten Carbide |
| Mass | 1.0 g |
