... practical, dependable instrument of rail flaw detection. GCT-8 Rail Ultrasonic Flaw Detector has the following characteristics: 1. 7+1 detecting ... mode will expediently change to Mode B, and show the ultrasonic image within the range of 960mm.A/B two modes ... storing and replaying function. The internal memory may record A ultrasonic single breadth and dynamic image, of which the acting image ...