Amazon.com: EatSmart Precision GetFit Digital Body Fat Scale w/ 400 lb. Capacity & Auto Recognition Technology: Health & Personal Care
The body fat measurement tool is NOT ACCURATE. It tells me I'm around 9% body fat. I'm really around 12% body fat. However, if you follow a similar lifting and eating schedule like I do, it's very useful as a PRECISION tool. For example, I eat cyclically. I eat low carb on specific days of the week, high carb on specific days of the week and follow a 7-day workout routine (I'm the guy with a notebook at the gym so I can track my progress and make sure my lifts are increasing). If I were to measure my "body fat" on a Saturday, which is a high carb day with lots of heavy lifting, and then on Wednesday, which is a low carb day I take off from the gym, the results would be totally useless because I would bloat from the water weight post-carb-up and it would throw off the numbers radically. However, if I weigh myself at 6pm every single Wednesday, the scale suddenly becomes very useful. I can take data points every Wednesday at 6pm and over 12 weeks would give me a very precise graph of my progress.
If you adhere to a regular eating and exercise schedule like I do and eat "similar" meals, then this is a very inexpensive and useful tool. If you eat sporadically, have no regular exercise schedule and pretty much eat whatever you want casually within the PB, this wouldn't be quite as precise but still very useful. You would just have to plot a lot more data points over many weeks and your graph would have a lot of sporadic ups and downs, but over months it would give you a great idea of progress.
I will say this: the scale itself is AWESOME. VERY ACCURATE. It's just the body fat analyzer that leaves a lot to be desired. If you care to track your results and plot them in Excel or something over months, then this will be useful in terms of precision.