M2 stylus with 1.0 mm ruby ball, stepped carbide stem, and 3.0 mm diameter x 5.0 mm long stainless steel base. Minor stem diameter is 0.7 mm; major stem diameter is 1.0 mm. Stylus length to ball center is 15.0 mm. Stylus weight is 0.32 gram.  Compare to Mitutoyo K651246.