Mike,
In the homemade category I have made a simple incidence meter that uses a laser level.Key points are:-It uses the horizontal light from a standard laser level.
The light is reflected from a mirror mounted on a clamp bar back to a scale mounted on the laser level.
As long as you remember that the light beam diverts twice the angular movement of the wing and the scale
must always be at the correct distance from the mirror it is pretty straight forward.
The scale reads to 0.05 degrees per division and it is easy to see a half division change so it’s quite sensitive.
Sensor bar is light so it doesn't distort the surface.
There is a detailed description on this site
http://www.nswpattern.org.au/Blog/En...ce%20Meter.pdf. These pics should give the idea of how it works. Would also be easy to add a mirror to an existing clamp bar. Main trick is to get the calibration right.
