About 2 years ago I bought the Omron Body Composition Monitor. It measures your weight, body fat, visceral fat, BMI and skeletal muscle.
It was quite a party piece - every visitor wanted to have a go. Some were quite smug about the results others quite worried. This may have prompted the latter to do something about their adverse results, hopefully visit their GP.
I monitored myself for about 6 months and the readings were fine and so I lost interest and the monitor ended up in a cupboard.
Just recently there have been health programmes on TV and more emphasis on the benefits of exercise and the impact on the body. I remember that one of the concerns was about the fat that you can be fine weight wise but you could be accumulating fat around your internal organs (visceral fat) and if this is significant you may wish to examine your lifestyle.
So curious to see how I was faring I resurrected the Omron and have started monitoring again. All my readings were fine apart from the body fat which was just a tad over the ideal scale even though I am a regular exerciser. So maybe for my frame I need to lose a little weight..........
Amazon have a similar item on offer for £49.95 (RRP £119.95) - I know I paid much more than this.
It is a useful tool if you are concerned about health and fitness and your general health. It is also useful as I have found to revisit from time to time to make sure that there haven't been major changes.