Statement #1 - I also tried dampening my feet with no improvement. That is why I did not recommend this in my article.
Statement #2 - I have not used the Omron, but I do like the Tanita because it gives you both measurements. I'd rather have my second check method come from skinfold calipers, but I have greatly lowered the amount of times I use calipers because I've had such good success now with my Tanita TBF-551 scale. My measurements have varied no more than 1.5% in a week for 3 months now (usually less than 1% and I can predict if it will be high or low each time)
Statement #3 - Agree! Agree! Agree!
Other comments - Kingprotein brings up some good points about trying to measure at the same time. This may be impossible for some, but it should not really screw up your results too bad. Measuring at different times of the day, such as morning compared to evening compared to bed time WILL DEFINATELY screw up your results.
The fluctuations you see with bioimpedance are due to hydration differences, so expect to see them when you drink different quantitites of water or consume different amounts of carbohydrates. Here's 2 examples:
Example 1 - You drank much less water on Wednesday than normal including no water after 8pm and you go to bed at 11pm. Expect to wake up dehydrated on Thursday and see a low body weight and a higher % body fat. Water (73%), Protein, Mineral and Glycogen make up lean body mass and water makes up the greatest portion (I can add the other percentages later, just don't have them off the top of my head). Fluctutations in water don't change the amount of fat on your body, but it does change the ratio of fat to lean body mass so prepare accordingly.
Example #2 - You're doing a cyclical ketogenic diet. You're carb depleted M-F and carb load on Saturday. Expect Sunday morning to show a large increase in weight and a significant drop in %body fat. You likely added around 5lbs of glycogen and water (lean body mass) (each unit of glycogen needs 2.7 units of water for proper storage).
Bottom line - I recommend skinfold calipers to most people who are starting to measure their body composition not because I think that calipers are significantly better, but because bioimpedance requires a thorough understanding of the underlying components of body composition science and research to truly interpret the results. Here are my current recommendations for those using an impedance device:
Every morning (first thing after going to the bathroom) measure yourself in the nude or wearing minimal clothing. Drop the first measure and take 2-5 other measures until you see the same one at least twice and average the other 2-5 measures for your daily body comp number. You will have a lot of day to day variation so don't worry too much about day to day flux. Once you have 7 measurements (Mon-Sun), average them and that will become that week's body composition measurement. Compare weekly averages. DO NOT compare day to day flux or you will go nuts. I guarantee it. Stick with weekly averages and you will have a good experience.
If you guys liked what you heard, send TC an email. I submitted an article detailing my thoughts on practical body compostion measurement for the body builder. Questions on this topic are constantly arising and I think the article should handle most of anybody's basic questions. And if there are more detailed questions, you guys always know that you can find me right here on the forum.
Good luck and happy measurement!