We know the classification of kitchen scales, which helps us to choose the kitchen scale that suits us. General household kitchen scales have lower accuracy than hotels need; The measurement accuracy of Chinese style is lower than that of western cake. Moreover, mechanical kitchen scales are generally divided into 1kg, 2kg, 3kg and 5kg, and the accuracy is at least 5g, which is suitable for occasions with low accuracy requirements. The general weighing range of electronic kitchen scale is 5KG, and the minimum accuracy is 0.1g. At present, two AA (No.5) dry batteries are widely used in the market, and the early embedded CR2032 button battery (inconvenient and relatively expensive to buy) has been gradually eliminated. Conventionally, an electronic scale has only one range and precision, and the precision of kitchen scales with different ranges is relatively different, such as 500g * 1g, 7kg * 1g, 3kg * 0.5g, 2kg * 0. 1g, 1kg * 0.2g, and so on.