turbine flowmeter vortex flowmeter L?u l??ng siêu âm Ultrasonic Lo?i ?i?n t? C?m bi?n áp su?t hóa ch?t ??NG H? L?U L??NGThree-section patrol measurement; 3-section patrol Display screen/highest Exhibit and two features switching; enter open circuit and fault self-test Show and output; cooling admirer computerized get started and prevent output;