Cute toy. But it really makes it obvious that Star Trek got it wrong. Your faithful reproduction of the interface makes it clear that, as interfaces go, the tricorder's interface really stinks. Lots of big, unnecessary buttons, a tiny, tiny screen, and a generally poor layout really makes it clear that the tricorder is only useful as a prop in a TV show; it would flop as a real-world device.
Strangely, they got it "right" with the on-board computer interfaces (touch-screen LCARS), but the tricorder is all physical buttons and almost no screen!
Star Trek should have had pocketable all-in-one devices, like what's happening in the real world.