I have some sort of ProScale, I think an LC50---one of the digital pocket scales that sell for a few tens of dollars, similar to the MyWeigh products (indeed I wouldn't be surprised if it the different brands all come from the same factory). It claims 0.01 g resolution, but for anything that fine I use a stock solution. In particular, I have a jar of phenidone in glycol and use that instead of relying on weighing out those tiny amounts of phenidone.
For developer-in-small-batch uses, it's been absolutely fine for me. At the price point I don't believe it can possibly be as accurate as it claims, but I haven't seen that its limitations are a practical issue.