The inside of a wet water meter is filled with water, and its counter is also immersed in the water. However, the dial of a dry water meter is isolated. Surely, there will be no full ingress of water into the dial, so it won't be affected by impurities in the water. The wet water meter has certain requirements for the installation environment. If the water quality is poor, it will cause the water meter to turn yellow or black. On the other hand, the dry water meter won't be influenced by the temperature, as it is isolated from the water.

### I. Differences between Dry Water Meters and Wet Water Meters 1. If we choose a wet water meter, generally speaking, it is filled with water inside, and its counter is also immersed in the water. Moreover, the counter of a wet water meter is driven by gears. However, the dial of a dry water meter is isolated. There will definitely be no full water ingress into the dial, so it will not be affected by impurities in the water. 2. The installation environments are also different. If a wet water meter is selected, there are certain requirements for the installation environment. Since the meter is filled with water, if the water quality is poor, it will cause the water meter to turn yellow or black. This will directly affect the reading of the water meter and may even lead to the water meter not working properly. This situation generally occurs more frequently in northern cities, mainly due to the influence of the urban water quality. But a dry water meter will not be affected by the temperature, because it is directly isolated from the water. ### II. What are the Common Types of Water Meters? 1. In terms of types, there are now smart water meters and mechanical water meters. Smart water meters are already very popular nowadays, and their usage rate is very high. Because smart water meters are more convenient for management. However, smart water meters also come in different types, such as electromagnetic ones, as well as dry water meters and so on. 2. In addition, if classified according to their measurement principles, there are mechanical water meters. One type is the velocity type, and besides, there are also water meters equipped with electronic devices. 3. There is also the electronic water meter. Of course, there is a distinction between mechanical sensing and electronic sensing. 4. If classified according to their calibers, there is one type with a caliber of less than 40 millimeters, which is called a small-caliber water meter. There is another type with a caliber of more than 50 millimeters, which is called a large-caliber water meter. Whether it is a dry water meter or a wet water meter that is chosen, their accuracy is very high. Different water meters can be selected according to different regions. For example, in the north, dry water meters can be chosen, while in the south, wet water meters can be selected.