Mike,
The Miracle K-012 Throw Meter is absolutely stellar. It is an analog meter with a ball bearing movement. I would put it up against an electronic meter. It is very light and does not deflect the control surface. The AnglePro is heavy and the servo winds up fighting against it. With good eyes you can probably get +/- .25 degrees accuracy. Or +/- .5 degrees. The key here is that these readings are repeatable. The digitalis are less so. I think I paid $25 or so. Just a thought.
Ken