Oops, sorry, didn't read the post from you about scales properly!
If you get digital ones, they should be fine! I don't know how they'd be different from doctors ones. I had to get weighed a lot at the drs for an ED and they looked exactly the same ones you'd get in a normal shop. There wouldn't be a huge inaccuracy and even if they were a pound or two out, you can still use them to monitor weight change or maintenance.