The main thing about
body fat percentage ESTIMATES, which is what all methods are - is to be consistant and ensure that they are moving in the right direction. Whether you have a caliper that says 14%, a tape measure that says 18%, or a scale that says 21% today and you re-check next month WITH THE SAME METHOD and it gives a lower BF% and your LBM is the same or more - then you are doing good. If not, then you aren't. The method doesn't matter as long as you do it the same way, same time, same bowl content, same hydration level each time.