newyorkstadium,
It is hard to describe what it shows. It does show a swingpath but not a correct swingpath. Since the app is only designed for serves, it shows the swingpath over the head and it is somewhat of a hybrid between a forehand and serve. I would not recommend it for analyzing forehands.
Currently, we have no plans to carry a scale. However, I will pass along your request to our buyer.
Thanks,
Brittany, TW