CES 2019: HiMirror wants to help track your weight
https://www.cnet.com/news/ces-2019-himirror-wants-to-help-track-your-weight/
It's also supposed to be able to determine muscle to fat ratios and suggest exercises for you.
We've tested out the Naked Labs Body Scanner, a device that rotates while you stand on it to create a 3D image of your body with your measurements and changes over time.