I have had many different types of scales for many years and this has been the best and the most accurate one that I have ever had. It can save up to 4 different people settings (the most I have see so far) It covers the most important health concerns, along with your Body Weight -- Body Fat Composition, Body Mass Index, Bone Mass and Body Hydration. With the, up too 4 persons, tracking your progress to set your weight goal and calculating the weight differences between your starting point, your previously saved weight and your set weight goal.
One issue that I have with it is the instructions are not very clear on what you should do. What I found works is after you set up each persons settings. Pick a time in the day (the best time would be right after you get up and go the bathroom then weigh yourself. Click on your number, say one, and when the scale shows 0.0 stand on the scale and stand still The next screen you will see will be your weight, do not get off yet, weight for the next screen will show your weight again along with your Body Fat in the lower right corner, do not get off yet, when the next screen come up, this will show your Bone Mass instead of your weight. At this time get off the scale and press the SELECT button to save your data. Now you can use the up and down arrows to look at your data. If you do not save your data it will be lost for good. So as far as the instructions go if you just skip instruction (A) and follow instruction (B) (the instruction I just gave you above)you will be able to review everything the scale will do for you.
One more thing the instruction do not cover is what does the Bone Mass number you get mean. The instructions only say that it measures the weight of bone or amount of mineralized tissue in the bone in your body. It does not tell you if this number is good or bad or low or high or what to do with this number. The instructions go over a lot of information about Bone Mass but nothing about what this number it give you really means. I have look all over the Web with not getting help with understanding what this number still means. My guess is that this number is a % of your total weight is your Bone Mass but I could be wrong. Other then this, I still think this is a very good product and will help my family work toward our goals of weight management.