Works great - Hornady Lock-n-Load Anvil Base Kit for Bullet Comparator

This is a genius yet simple addition to help make precision measuring more accurate and a lot easier. This tool does make case and overall length measuring a lot easier because if the added surface area. I bought two of them to use on the top and bottom of my calipers. It mounts easily to your calipers without the need for any tools, it is of great quality, highly recommended.