Ultrasonic water meter is a new type of water meter that detects the time difference caused by the speed change when the ultrasonic sound beam propagates in the water upstream and downstream, analyzes and processes the water velocity, and further accumulates the water flow rate. It can be widely used in water supply metering of water supply companies and used to measure cold drinking water flowing through water pipes. The technical indicators and performance of the product meet the following standards GB/T 778 series standards and the factory verification is based on the JJG 162-2009