... and boiler pressure vessels, etc.The digital ultrasonic flaw detector is an essential instrument for non-destructive inspection industry.Basic ... (mm): 0~10000Steps: 2.5,5,10,20, 30,40,50,60,70,80,90, 100,150,200, 250, 300, 350, 400 ... . Our main products are Ultrasonic Oil Level Meter, Ultrasonic Liquid Level Meter, Ultrasonic Flow Meter, Ultrasonic Open Channel Flowmeter, Ultrasonic Sludge Level ...