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the tool you need is called a sliding t-bevel...
http://en.wikipedia.org/wiki/Sliding_T_bevel
there are cheap ones for a few bucks that will do the job...but it seems your goal is to spend a pile of money... buy a nice rosewood and brass one (even these don't cost a pile of money, but they are nice tools)
http://www.woodcraft.com/family.aspx?familyid=424
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Tim:
I already have one of those and I was planning on using it with a protractor if I needed to.
But what I wanted was an all-in-one tool, for easy spedy use.
I don't need to spend money but I will spend $30 to get an all-in-one. That's it's digital is frosting on the cake.
I had hoped that the T-bevel had angles on the blade and that would have been perfect.
thanks for the leads tho.
Lew