I have About 10 compasses and Im dissatisfied with them all. the biggest problem is that they change their settings as you use them because theyre so fragile. I love this new Tramel because you can set it and it stays there and you can throw it around or drop it or whatever and it still stays at that setting. It gives you complete confidence in what youre doing. Im using it now with about a 6 inch bar but I know I can make the bar Longer if I needed. I am completely satisfied. I use it mostly for work on my wood lathe.