Ordinary mechanical water meters, that is, the common water meters used in our previous home. The basic working principle is to use the pressure generated by the flow of tap water to drive the rotation of the internal gear of the water meter, and the gear under the water meter display plate to drive the rotation of the pointer to count, so as to achieve the purpose of measuring water consumption, because the price is very low, can also achieve the role of counting, so the scope of use is very wide. But ordinary mechanical water meters are mostly indoor. When water management departments want to read meters for users, it is difficult for users to ensure that they are at home, so they will increase the workload of meter-reading staff to run back and forth many times, because it is manual meter-reading, and it is easy to charge less, more or even no fees. Fees and other phenomena, and if the water meter is put outdoors, management is relatively convenient, but the accompanying problems also follow. First of all, because many water meters are copper, there will be many illegal people smuggling watches to sell at night; and the low temperature in winter will cause a large number of water leakage, causing losses to water companies. There is also a mechanical watch wear larger, it is easy to forbid or break down.