I’ll admit this is kind of petty, but I was using Google Image Search to get some ideas for an icon (i.e., I was looking for inspiration, not for images to steal) when I came across a picture of a scale that looks an awful lot like the icon for another weight tracking iPhone app. It looks like the exact model is a Taylor #938.
The icon for FatWatch, by the way, was designed by Steve Dressler. If you like it and you need some graphic design work done, you should give him a call.