... as aerospace, railway transportation and boiler pressure vessels, etc.The digital ultrasonic flaw detector is an essential instrument for non-destructive ... 300, 350, 400,450,500,600,700,800,900,1000,2000,3000,4000,5000,6000,7000,8000,10000Adjusting step: 0.1mm ... Professional --- 12 years experience on R&D ultrasonic products since 2000. Responsible --- If any problem of quality, be responsible for all ...