I've been waiting for someone to finally make a consumer stud finder that works and this just might finally happen after this deregulation of the spectrum.
The construction industry would hand over wheelbarrows full of money for a BLE phone-paired puck that located studs and pipes behind drywall. Someone could even sell a "pro" version that combined the data from multiple pucks to render a 3D point cloud of the inside of the wall on the user's phone.
Most studs have things (like drywall) nailed to them, and the nails are usually made of iron. So, all you need is a high-power rare earth magnet. I use a particularly strong refrigerator magnet.
If you want to splurge (or are willing to couple trips to the coffee shop), you could buy one (or two) of these:
I was tipped off to these by the someone in the construction industry. He buys a few whenever they're in stock, so that he can have them in every toolbox, lose them, etc.
Note that, once you find a nail head, you can just leave the magnet hanging in place. If you have two, you can hang both, then use a straightedge or chalk-line to mark the point between the two where you want to make a hole. The fancy radar puck thing can't do that. (Maybe, someday, fancy AR goggles will solve that problem, but we're a long way off from that.)
The construction industry would hand over wheelbarrows full of money for a BLE phone-paired puck that located studs and pipes behind drywall. Someone could even sell a "pro" version that combined the data from multiple pucks to render a 3D point cloud of the inside of the wall on the user's phone.