I have now tried 3 different brands of the actual scales. cant recall the names of them off hand at the moment, wll edit later to add them. My expierience....
The three different ones i tried all had the same issue.
3 days straight of using it, under same conditions (time, time between meals, time between consumption of water, etc) and I got 3 different measurements. they showed that my weight was the same, my water weight the same, my bone mass the same, yet my BF would vary on these damn scales by as much as 4% in 24 hours. How the hell can my weight, bone mass, and water weight all be the same, yet by BF change that much?! Ha ha
IMO, dont waste your time or money. Just use the mirror. If you are looking good, then good!