The accuracy of water meter measurement largely depends on installation and use. When installing a water meter, impurities such as hemp fibers and minerals in the pipeline should be removed to prevent blockage of the water filter screen, otherwise it will increase the error of the water meter; Horizontal installation (excluding vertical water meters), the dial should face upwards, and the direction of the arrow on the case should be consistent with the direction of water flow; Sufficient straight pipe sections must be left at both ends of the water meter. If you suspect that there is a problem with the water meter measurement, do not disassemble it without authorization, and promptly report it to the relevant department. Street vendors often sell powerful magnets that can slow down water meters, which is purely misleading. Citizens should not be deceived.