Very accurate 5

First of all this is really design balance and quite pretty. It allows 8 different people weigh themselves and especially to be recognized automatically.
The balance is supplied with 4 batteries and after having put on the back of the device, it will just change the mode in kilograms (kg). You can also weigh in pounds (lb) or stones (st).

To use it is very simple: Just get it and your weight appears :). At the bottom left you will see a small U followed by a number. This means that you are the user U1, U2, ...
Personally I am user U1, U2 my son, my daughter and my wife U3 U4.

When you weigh item balance will recognize you automatically, you display your current weight for 5 seconds in blue, then your previous weight for 10 seconds and then you will have the weight difference will be displayed. If it is red is that you have grown and if it's green is that you have lost weight :)

The balance is really accurate and that adding the notion of user and calculating the weight before is really great!