BodPod vs Dexa
Sorry to take this a little off of what your asking but I'm pretty obssesive with bodyfat testing and can share my personal experiences with bodpod at least. I have never done the dunk tank but very familar with the bodpod along with military tape testng standards. Two weeks ago the wife and I had both Dexa and BodPod tests done.
Our last testing was via bodpod 8 weeks prior.
BodPod Testing in Jan
Me: 10.5%
Wife: 33%
The recent test was 8 weeks later and in that time I have been bulking and gaining and the wife dieting, wife was doing great with losing inches but not much weight throughout this time period. The dexa results were very confusing since it put me leaner then expected and the wife much heavier then expected.
3-16 testing
Me (gained 17 lbs albeit mostly water retention)
Dexa: 9.9%
BodPod: 13.0%
Wife
Dexa: 33.9%
BodPod: 20.9%
Dexa put me 3% leaner then the bodpod and put the wife 13% heavier. Another oddity with the dexa testing was the staff kept fusing over the wife telling her how fit and athletic she looked, meanwhile she's ready to cry looking at the 33% (obesse) number wondering what the hell they were talking about. Also I know Im retaining a lot of water at the moment but im not anywhere near seing my abs, I just cant belive Im at 10%. So again a bit confused with both our results and claims at this testing method being the most accurate.
I can say it was pretty neat in the info it gives though including weighing and giving you the bodyfat of each of your limbs seperatly to compare complete symetry.
The bodpod and dunk tank are both formula based meaning there are several different forumlas the tester gets to pick from and use for your testing, each of which could provide different results. This is just my opinion but to me this shows the test is not equal to all and will have a range of inaccuracy.