I had hydrostatic testing today for the first time and it was pretty close to what I estimated myself at.
They actually did 2 kinds of testing: Calipers, which showed 21% and hydrostatic which showed 23%. i don't know if I got all the air out of my lungs (probably not) which makes a slight difference. I am a 50 yyear-old female at 5'10" and 138 lbs. I was pleased with the results, as they were well within the "very good" range fo rmy age, but I would like to be 135 and 20% bodyfat. I can get to 135 without too much difficulty, but I sacrifice muscle for it. I am working on that! For those of you who can get hydrostatic testing, I recommend it. The only other more accurate testing is DEXXA testing.