I have a Robart meter. I have had it for years and used it to build many straight, good flying airplanes.
I also now have the AeroPerfect meter. I do not know how I lived without it. I still use my Robart for quick checks and for the bars and adapters. There are just so many uses for these meters that you are only limited by your imagination.
Good reading if you have a few minutes
http://www.aeroperfect.com/index.html