Body Fat

I discovered this morning that our scale actually can calculate your body fat percentage. It supposedly sends little electrical waves through your body (something like that) that can then allow the scale to calculate your body fat percentage based on your height, weight, and age. It's pretty interesting. So, mine is 23.4 percent, which is apparently in line with where I should be, although it couldn't hurt to be less. Just one more thing to obsess about!! I thought I loved taking my temperature but this is way better!!!! FYI - I measured this before and after using the restroom and while my weight changed just a tad, the body fat did not. I guess that makes sense... ;)
I wonder if I could put in the height, weight, and age of my thigh and find out it's body fat percentage...
http://www.amazon.com/Thinner-Scale-Conair-TH304-Hydration/dp/B000OCP5WM/ref=pd_lpo_k2_err_k2a_3_img/105-5716473-0965269