Bathroom Scales are used to measure body weight and some bathroom scales can be used to determine body fat.  Products like the Omron Body Fat Analyzer helps accurately track body fat to monitor progress in losing body fat while the Bios Fitness Digital Scale allows for accurate weight measurement.  Analog bathroom scales come use springs to determine weight.  Digital bathroom scales determines the weight in the same way, but provides that information in a digital readout, providing an easy-to-read, accurate number.
Bios Fitness Slim Digital Scale
Bios Extra Wide Talking Scale