HJ-UD-A series Ultrasonic Doppler flow meter                    
                
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                            HJ-UD-A series Ultrasonic Doppler flow meter is a high-performance, fixed-type flow measurement product independently designed and developed by ShenZhen HuaJu Scientific Instruments Co., ltd. Its fundamental principle is to measure water flow velocity and water level (area), and then calculate the flow rate of the water cross-section.