... ultrasound transmission ST301The ST301 ultrasonic flowmeter is an economical and robust flowmeter that utilizes cutting-edge technologies, such as balanced ultrasound ... many other technologies to achieve high performance.Features:Compact and robust designHigh accuracy, better than ±1%No moving part s, ... weather-proof enclosurePower supply 9~24VDC, less than 1.2Watt robust Ultrasonic Flowmeter ST301