Seems like it could be useful, but would like to see a selection to pick what units you display the measurements in. Also, seems like you can only measure the predefined locations that have been preselected by the app. If they don’t get selected or selected incorrectly, it may be an issue to select something you actually want to measure. Otherwise it is a good concept to improve on.

When you start to try and measure the entire view is taken up with all the rectangle you can try to measure. This makes it almost impossible to select a surface, because any rectangle in the way of the one you’re actually trying to measure gets in the way.Also it’s metric only.