I have a Lufkin dial indicator, scale, and some calipers I traded for. My FIL was a railroad machinist, once asked me if I did "fine" work using a mike. I do, he did "only" fitting tapered stay bolts using an inside caliper, transferring to outside bow calipers,turning the taper to fit the reamed hole, and they had had to be tight at both ends. So much for fine work. They took the lathe to the loco with a crane.