Mostly on model planes when setting up the wing.
commercial unit here Accupoint
Step 1: The meter's components
1. the body, (simple aluminum curtain rail) to attach the othe components
2. the freely swinging laser cradle
3. the legs (for gripping surfaces)
4. the scale (marked in degrees)
Firstly the legs, made out of scrap wood and miscellaneous hardware for the swiveling action.