We got this bathroom scale. It measures body fat, water percentage, and bone mass.
I did some research about all the different scales, in the under-$10,000 category, they are all pretty much the same, fairly inaccurate but fairly precise. That’s to say it might measure your body fat percentage incorrectly but if it goes up or down, it will track it well. This one cost $30 and works just fine.
Here’s the manual: Conair Weight Watchers scale