With a Robi scale, you can measure your weight and perform body analyses. You can measure your fat percentage, body water percentage, and muscle mass, for example. In the accompanying smartphone app, you have a clear overview of your readings. Want to perform accurate readings per body part and keep an eye on your heart rate? Go for the Robi S11. Choose the Robi S8 when you want to measure your heart rate but don't want to perform an analysis per body part. Isn't the heart rate reading that important to you? The S6 is a good choice.