Practical is not only the power supply via three AAA batteries / rechargeable batteries, which can usually has been in the home and also easily recharge. But also that almost the entire surface can be used as a storage area, so that the small size of the scale is exploited efficiently.
Only the operation via the touch-sensitive buttons are not as reliable as one would expect from capacitive touch screens is her example. Accustomed why sometimes you have to push a button several times before anything happens.