Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4706068.

I needed a better way to measure distances for larger, odd shapes, etc. Other than buying some, didn't see any others that were the size I wanted, so I drew these up in Fusion 360.

"Outside Calipers x.stl" pair require the "Cap" pair to connect together. Tight clearance to make the hinge cap secure. Calipers will move easy enough, but not too easy for measuring.

Maximum distance is about 351mm or 13.8".