Navy collar devices and the Pin-iT Card. Military uniform tool. www.pinitcard.com /military...

I never had that problem - I have a "calibrated eyeball"...

That would have been nice to have in the day. One thing I did not know until joining RP is that the officer rank insignias are slightly different between the Navy and the other services.

Just saying anything other than a ruler means service members won't know the proper measurements and therefore constitutes laziness and a lack of discipline. There is no replacement for proper knowledge and a good eye.