ORIGINAL: spaceworm
ORIGINAL: vertical grimmace
It is important to realize that the incidence needs to be measured through the centerline of the airfoil and not simply by using a ruler or straight edge on the bottom of the wing. A common error. That is why I like a commercial incidence meter as they center themselves properly with the airfoil.
Realizing the importance of that, I made a jig that centers the platform, on which the angle meter rests, on the leading and trailing edge centers. A simple V shape on the beam ends between the edges insures this. You do not need the expensive commercial meter unless you are incapable of constructing this simple jig that I made out of wooden paint sticks free from the big box hardware stores. Or unless you have excess money to spend.
It can be difficult to assume the abilities of others.