Capt Ron,
I agree with kivisto, I use the Robart and it's been fine. I understand there is some ditials but I don't have any names. My RC guru likes the Robert too. He fly’s completion aerobatics and scale, and he trained me so I trust his word.

As long as you don't have a problem seeing it's great. Also if you think about it when you start you don't really have to level the plane to "0". As long as the other surfaces read the same number they all should be “0” to each other.
Now in the case were a wing is to be either positive or neg. to another surface lets say the horzi. stab. Then I guess it would be better take the time and level it to“0”.
I hope that makes since, if not read the instructions, I found them very informative. Then you can work out a procedure that you like.

Again here is the link that kivisto posted.
http://www3.towerhobbies.com/cgi-bin...ncidence+meter
Good Luck!
Shubova
[8D]