Does the Garmin Index S2 accurately measure body weight?

Yes. Weight measurement is not in dispute. The lawsuit concerns body composition metrics — body fat percentage, muscle mass and related outputs — not the scale’s ability to measure weight.

What is foot-to-foot BIA, and why does it matter?

Foot-to-foot BIA sends an electrical current from one foot to the other, measuring resistance only through the lower body. A four-point system that uses both feet and hands measures more of the body directly and is generally considered more accurate for body composition.