I do not have any connection with this company, I was just curious whether this thing has been helpful to anyone. I guess, analogous to an AOA, it’s a gadget that you don’t have to have, but it does not hurt to have it available..
The current June 2016 Aviation Consumer Magazine article by Larry Anglisano : Eye Aligner: A Sight For Flight had this to say:
A portable version of the seat height adjustment spheres found in jets helps you dial in the proper view over the glareshield. We think it’s worth a try.
Anyone ever used this in their private personal plane or rental?
Website: http://www.sightforflight.com/why-purchase-an-eye-aligner.html



