Questions about Beurer Body Complete

For a pure weight measurement, the panel does not need to be held in the hands, but for body fat percentage, muscle mass etc. it must be held in the hands.

No, it is the BF105 model. I can actually recommend the scale itself, but the existing software, whether Windows or Android, is practically unusable. The synchronisation is pure coincidence and the statistics displayed are unusable. Please read the comments on the HealthManager app.