I've owned a Withings wifi scale for a few years. Just step on it in the am and it sends your weight and bmi to your app on a phone or laptop. Very handy because it graphs the results out instantly and shows trends.
Now, Withings just came out with a pee collector that sits in the front of your toilet bowl.
It analyzes the urine and reports the findings to the same app on your phone.
It's kinda expensive ($500) but for the health conscious, it's prob well worth it.
The link below tells what it looks for. (kidney issues and many others)
And a pic of what to aim for.
https://news.yahoo.com/pee-magic-number-withings-puts-163647125.html: