Our Digital Case Neck Micrometer will measure neck thickness to 0.0001 inch on cases from 17 caliber to 50 BMG. The Sinclair designed anvil is the same as on our MIC-3 Case Neck Micrometer. The digital micrometer head powers on and zero sets with the push of a button, and the large friction barrel makes it easy to achieve a very repeatable feel. The micrometer head features inch to millimeter selection, power off after 5 minutes of inactivity- roll thr friction barrel to re-activate without re-zeroing, data output and absolute or relative measuring. The Sinclair stand positions the anvil and micrometer head at a stable and comfortable position for repetitive measurements, and the display can be tilted to the user's desired position. Comes with a hard case for the micrometer head, 2 batteries (one spare) and instructions. This is a great tool if you are neck turning for tight necked rifles.