You must have the Etekfit body scale to use this app. It is a great scale, easy to use, good-looking, large area to stand on, and it instantly reads your weight with no buttons to press. The scale with this app estimates a variety of body metrics like body fat, muscle mass, etc. and your long-term trend can easily be seen in graphs for each of the metrics. Nice. However, the app is not graphing muscle mass percent correctly. And it would be nice to see all data for each metric in the list view instead of only one at a time. Besides these two limitations this app is swell.
EESeal about Etekfit