I use a CJ4000 digital scale for coffee. Up to 4 kilo to a 1/2 gram. And a far from new bathroom scale (using me with or without bike). Maybe I can read it to a half pound. It does correspond nicely to the doctor's scales. I step on it before I go.

But accuracy? Until you calibrate them, who knows? And all my water measuring devices are glass containers that get bigger as they go up, so the error in the judged contents goes up as you fill it. Measuring cups. Cooks don't seen to have our obsession.