Portable ultrasonic flow meter enables non-contact measurement of liquid flow. By installing the sensor on the outer wall of the pipe, the flow measurement can be completed, which is convenient and accurate. Built-in printer and SD card memory for immediate or timed printing of set measurements. It is widely used in tap water, heating, water conservancy, metallurgy, chemical, machinery, energy and other industries, can be used for production testing, flow comparison, temporary monitoring, is a necessary tool for flow detection.