... more channels 3. ultrasonic flaw detect 1. Big Oil and Gas Pipe and tube detection---Ultrasound 2.reach the demands of ... tube, zirconium tubes, book-walled pipe, seamless steel tubes, welded gas and oil pipelines, nonferrous metals, ferrous metals and some non ... .Each channel has three strobes, alarm strobe, tracking strobe, self locking strobe;Complete alarm function, can meet different kinds of needs ...