A body fat monitor functions by sending a small electric current charge through your body and monitor how fast it can get through to the other side of your body. It is of course, the faster the current can get through to the other side of your body, the better it is for you. The body fat monitor will then return the percentage of your body fat to you. You can then refer to the charts that they usually provide you with, or on the Internet, and see if your fat percentage is normal or high.
These Body Fat Monitors are now very affordable. They used to be bought only by beauty centers and slimming institutions, but now everyone can afford them. Like Nebulisers and Blood Pressure Monitors, you can buy one from as little as $20 from online shops and they are small and easy to use for home users.