I ordered the Tanita BC- 532 body composition scales a few months ago. You step on them and they analyse your body composition, providing you with:
- Weight
- Body fat percentage
- Body water percentage
- Visceral fat levels
- Basal metabolic rate
- Bone mass
- Muscle mass
It's an awesome bit of kit and calculates all of the above in around 20 seconds. They cost around £100 (cheaper on E-Bay, I got mine for £70). For the price of the most basic medical check-up you can get these and use them every day. Highly recommended if you're serious about healthy living.