A gauge used to quickly mark locations on the ends of a 2 x 4" beam (actually 1.5" x 3.5" = 38.1 x 88.9 mm).
Based on this: https://www.amazon.co.uk/Rakuda-2-4-Square-Ruler/dp/B001Y51VUI
There's another version with a third side to fully lock the gauge relative to the beam.
Edit the SLDPRT as you wish, but be warned that the VarPattern features take a bit to render.
You need to disable trailing zeros under Document Properties, quit, & restart SW so that the numbers render without x.00.
The author marked this model as their own original creation. Imported from Thingiverse.