In reality, accuracy is first not attainable in body composition and it is not necessary. The vast majority of us use one method of body composition, be it skinfolds, bioimpedance or hydrostatic weighing and use it to track our changes. I have done research in the field of body composition and have read over 150 journal articles and texbook chapters that cover this topic. Use a body composition measurement tool to track your progress, but use the mirror as the final judge. If the calipers say that you are 17%, but you want to get a little leaner, shoot for 15%. Just make sure that you have the same guy do the measurements each time. Or better yet, pick up some calipers and learn to do it yourself. Unless you are willing to go through dissection, you will never be 100% accurate. Even if you get to participate in a study like mine that uses a 4 compartment model including a measure of body density from hydrostatic weighing, total body water from deuterium dilution and total body bone mineral from dual energy x-ray absorptiometry, you would only get to do it once. Yes, it is more accurate, but not useful at all. The nubmers don’t matter, it is the changes in the numbers and how you feel when you look into the mirror. For more information on body composition, please use the search engine and look up a post entitled “Why you don’t like your body comp numbers”. It was started by me and should give you some good advice and some more background on what body composition really is. Good luck. Please ask any questions if you have any and if you have trouble finding that post, let me know and I will bump it up for you.