How accurate are these usually? There is one at my Xsport Fitness gym I go to and I used it about a year and a half ago and tested low 7% range body fat, and I have gotten much bigger and stronger since then, probably about 20 lbs heavier, improved my diet drastically, etc, and I tested 12.2% the other day. I know I have put on a little fat but I don't think I nearly doubled, my abs still clearly show and I never eat cheat meals etc. Should I take that test with a grain of salt? Also has anybody purchased any fat testing calipers online that are accurate? I know they make some electronic ones that are nice, I think I saw one for $29.99 on nutraplanet.