Most modern bathroom electronic  scales display your weight in increments of 0.1kg (or the equivalent stone/lb), which is 0.1% of your body weight if you weigh 100kg. This should be accurate enough for the purpose of monitoring weight as an indicator of health.

The scale needs new batteries and is to be used on a hard, flat surface, preferably in the same place every time. You may have to step on it twice to be sure.

The best time to use it is in the morning after you go to the bathroom/toilet, and before breakfast. The more you weigh yourself, the more information you get, but weighing yourself several times a day just adds to the noise. Weekly weighing is usually recommended, but daily weighing prevents missing data points and possible confusion from daily fluctuations.

You have to interpret the numbers correctly. It is not fat that fluctuates from day to day, but water and waste. Fat loss or gain is slow, daily increments are small but can become nearly infinite, and they are within your control; water weight fluctuations can be large, but they are finite, they go up and down, and you cannot really control them, nor should you try. This means that even the most accurate scales cannot measure fat loss or gain on a daily basis, only over weeks and months.

In the end, you have to respond rationally to these numbers. If you have a goal to change your weight, remember that real weight change takes a long time, and stay calm.

Xiangshan Zhengtai Electrical Appliance Co., Ltd. is a digital scale supplier and mechanical scale manufacturer from China. The company designs, processes and sells mechanical bathroom scales, and other electronic scale products.