Hello Fred,

As long as the graduation is not on a wear surface,
The graduations are clear of wear surface, so no problem there.

I reckon any good industrial perm marker may work with the same technique.
How would you remove the access from the raised area?
Don't really fancy taking even the finest wet/dry to it.

I am sure we still use this stick in the repair lab, so I will get you
name and MFG in short time.
Much appreciated.

Regards

Geoff Halstead
Norfolk, England

(superheated - radiant at that)