Pointy metal tool

This was my grandfather’s. He worked for NASA, JPL, and finished his career at Groom Lake / Area 51.

It looks like some kind of measuring tool. It has a VERY pointy rod that slides in and out and is spring loaded. Pressing the rectangular switch causes the rod to extend out of the end from the tension of the spring inside.

It doesn’t feel like aluminum or steel on the casing. I think the pointy part is stainless.