Its helpful to practice the calliper measuring techniques... It helped me a lot before my practical exams..!
no way to know if your to far onto the cylinder or if you need to leave a gap. It would be better to have the app just pick random settings and you read it. I know how to read one and with this I was always out .005 or so. So will unistall it and move on. Nice idea but a person need to know how or why its wrong so there is no real learning here and you cannot go back and see the reading.
I really liked this as a way to learn reading a calliper, but it would be much better if the tool could "touch" the piece. Like a real one!