How about a non-folding ruler for you shop? I don’t think I could get along without my Starrett 6 inch ruler in my apron pocket
I also often use the blades from my Starrett combination squares as rulers:
But what about other specialty rulers that folks sell?
I did a bit of looking around on the internet and found these:
Bike Spoke Ruler
Model RR Rulers
General Purpose Rulers
Mat Cutting Straightedge
Phi (Golden Ratio) Rulers
Hook Rulers & T-End Rulers
Sewing – Seam allowance rulers _ There must be hundreds of different ones – especially for quilting – but here are a few.