I can find calipers no problem. I use the search all the time and didn't see where it could be crafted from. I have an advanced forge and must have missed it in there. Some of the items have where it can be crafted in parenthesis, the blacksmith hammer does not.
Awesome! Then I can't wait for 3.0. I do like the fact that I am not getting a over surplus of pistols. That seems to be reasonable now.