Seating dies are only accurate in about a .003 range. Dial calipers pretty much measure AOL. It's hardly worth spending a ton of money for that. I would buy a better micrometer and save money on the dial calipers. But frankly measuring to. 001" is normally a waste of time. When I have done it I have brought it over to a machinist friend. He rolls his eyes because he knows for reloading its pretty much a waste of time. But it does generate some epic threads.