I bought a few laser pointers from here:

[link=http://members.aol.com/laserpointers/laser002.htm]Cheap Lasers[/link]

Hard to believe they're that cheap.

I've been using them to set my control throws. The grid shows degrees (Note: they are not equidistant from top to bottom). It is very easy to see a change as small as 1/8 degree.

It has been very useful in setting up my second aileron/differential, and flaperons.

One thing this exercise has shown me is the inadequacy of my servos/linkages. It's surprising to see this revealed in no uncertain terms using this setup.

Actually the laser pictured here is from the GP Laser Incidence meter. I'm now using the ones from the Cheap Laser site. They seem to have a better point.