If you are speaking of a case neck micrometer, to measure thickness, I would suggest any well made ball micrometer and a stand. Sinclair sells a great set up. If you are looking for a micrometer adjustable case neck turner, there are several fine tools on the market. Hart, K&M, and Nielson are very well made and popular. If you are looking for a case length trimmer, the Sinclair unit, with the micro-adjust, is great.