This was so cool, I really want to see this (and thermal, and...) integrated into devices so we get the full tricorder thing going on.

I hadn't considered acoustics being a whole class of use case for maintenance, but imagine if we had one of these in our pockets how much better our built environment would get, since everyone would be able to see issues & point them out. Visualizing the invisible is a powerful way to get change.

Also that train wheel example was a real missed opportunity to say 'squeaky wheel gets the oil'.