Diabase, height gauge and scribe.

So i have been searching for a Diabase plate for a while, and the oportunity showed it self this evening and a acquaintance hade this 500x300x100 diabase from CE Johanson laying around. The company that made this is an old swedish one not far from where i live. The height gauge is an old analog one with a HSS scribe tool mounted. It will suffice for my purposes.