What does that cost? I would probably do that, too. I can’t imagine it needs to be done more than once a year.
I’m not sure if you were just messing with Mark but in case you were serious, I didn’t know that existed. I don’t know any tech on an Android phone that would let it sense density behind drywall. Good studfinders are gold. I would only buy on Amazon or some other place where I could read reviews.