Body fat is often referred to as adipose tissue, a complex connective tissue with a special role in metabolism and endocrine function.
If people just weigh themselves every day and get a feel for how much water they are losing, they really need a body fat tool to tell them how much fat they are losing. You may need a more accurate picture of what's going on. After all, we want to lose fat, not water.
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The only difficulty is that most gyms don't have a body fat analyzer; instead, you'll have to rely on a standard scale to determine your weight.
Putting the whole person in is cool: Just as most people aim to lose "x" pounds, you can now aim to reach your ideal total fat percentage by using your handheld device to monitor your progress.
Avoid trouble in your gym: Most gyms today measure this figure. I've never seen a machine scale like that on-site. They usually use a body fat meter to get the amount of body fat. To do this, you will need to schedule a special meeting with one of their trainers or vendors.
In short, a serious person wants to look good and wants positive feedback to know that they are on the right track.