... flaws: four 70°channels, two 37°channels and a0°channel.Compared with the present same kinds of products, this ... the detecting rate of flaws.Equipped with a multifunctional collation channel which has both single and doublereceiving and transmitting functions. ... report of flaw detecting operation to make it an easy job torecord ,recheck and print etc. GCT-8 rail ultrasonic digital flaw detector