Check your local drafting or art supply store- even online for a 24" (I'm sure they make all sizes) Gaebel rule. Arthur H. Gaebel, Inc. E.Syracuse, NY 13057.
Mine has sixteenth's and 100th's on one side and 32nd's and 64th's on the other. Well made. I had to search high and low for one because guitar scales are usually expressed in 10th's. I build guitars as a hobby. Good luck.
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