Question about Garmin Index Smart Scale

The question about the measurement accuracy cannot be answered in a general way. However, together with Garmin support, I can make this statement:

You will get the most accurate results if you use the device under the same conditions and at about the same time each time. Activities that temporarily affect your weight and fluid balance and distribution may affect the accuracy of the readings. Garmin recommends waiting two hours after you have eaten, drunk, exercised, bathed, or visited the sauna before using the device.

-Body Mass Index (BMI): Body Mass Index (BMI) is calculated by dividing your weight in kilograms by your height in metres squared. BMI is often used to estimate whether someone is underweight or overweight.

-Muscle mass: Muscle mass is the total mass accounted for by muscles. It is measured in pounds, kilograms or stones and pounds. The Garmin Index Smart scale measures and records skeletal muscle mass. Skeletal muscle consists of voluntary muscles that can be controlled by conscious movements. Muscle mass does not include cardiac or smooth muscles, which move without conscious control. Some examples of muscles that are not measured by the scale are: Heart, arteries, veins and gastrointestinal tract.

-Bone mass: Bone mass is the total mass accounted for by bones. It is measured in pounds, kilograms or stones and pounds.

-Body fat percentage: Body fat percentage is the percentage of total mass that is accounted for by fat. This includes both essential fat and depot fat. Essential body fat is required for the body to function normally.

-Body water percentage: Body water percentage is the percentage of total mass that is accounted for by fluids. This measurement can give an indication of your fluid balance.

The weight displayed on the Garmin scale is inaccurate. I use my old scale, which I actually wanted to replace, as a reference. When I weigh myself daily (shortly after getting up), I have deviations of 100 grams to 1 kilo compared to my old scale. Sometimes I weigh myself several times in a row and get different values. The product is not to be recommended.