I can only agree that smartphones are amazing things, I use mine as a music tuner , photographic lightmeter, recording device, sat nav, and much more, but I have no idea how it all works, it's beyond me and my understanding, so I'm quite happy to accept it's clever and does what it does. But I do speak from the position of someone who still uses photographic film,a wind up watch and freely admits to being a dinosaur!.
But I did find Michaels device interesting, it's a simple to use, fairly robust,portable device that fits in the pocket and can survive life in a coal mine, not the best working environment for a complicated bit of electronic kit.