Starret enjoys an enviable reputation in the machine tool industry. Their creations are in every machinists tool box. Why not bring such precision to woodworking ? True wood changes with the seasons. But if something is worth doing , it's worth doing right. This little tool will help you to do just that. It will measure very precicely down to 64ths of an inch. The markings are clearly visible. Much nicer than anything you will find at your local home center. The square is dead on accurate. It is guaranteed by Starret to thousanths of an inch. Use it to set up all of your cutting machines. If they are squared up with this everything will fit better. Everything will be more precise. Use it to set your router depth. Use it to mark the distance from your router baseplate to the bit for setting straight edges up. The list goes on and on. I feel that I must say one more thing though. Since this one is only 6 inches long , it is much handier to have around than the 12 inch. It also fits very nicely in your tool bags without falling out or poking you in the arm. Highly recommended.