Summary

Lindh3D Eye Measuring Tool (IPD) worked well but I wanted faster way to know the correct IPD setting for Quest (for guest users) so I made a new ruler.

Print it on any ordinary printer and cut just outside the black line and glue it in place.
Your glue might affect the length so check that the 68mm line is correct after gluing. Paper shrink and extend depending on moister.

I painted the arrow white on the EyeFinder white with Tipp-Ex.