Looking for recommendations for a fully local smart body scale for use with HA

Hardware
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1

I want to get a smart body scale for thr bathroom.

My basic requirements are:

  • Must be purchasable in Germany.
  • It should function fully locally. No cloud conndction.
  • It should at least measure weight and body fat (i.e. using electrodes on either feet). The body fat values should be consistent - I don’t expect that the values are super accurate in absolute terms (I have read that these scale struggle with absolute precision).
  • Some tinkering is acceptable to set it up.

I saw that there are Xiaomi / Mi models that run with bluetooth and require ESPHome to run. This would be OK for me.

EDIT:
I plan to use InfluxDB and Grafana to graph/track the data. (I am already using these for other things/sensors.)

2

BMI is just weight in relation to height, so it can be calculated easily on HA.

3

Good point. That was dumb. What I meant wqs body fat. I will update my post.

4

You know that the weight can’t really measure the body fat. It is just a pseudo guess.

What the weight does is measure the conductivity from one foot to the other.
It use that value to put into a formula to get the normal values for fat, water and muscles for a “representative” group of humans. It does change the values whether you are obese or anorexic.
Some weights have a setting for Athletic, but that is just YOU telling the weight that you have more muscles and then it will change the formula slightly.
At the same time the measurement is only done through the feet and legs, so if you weight lifting and doing more of your upper body than your legs, then it will be off and likewise if you are a bicyclist or horseback riding.