... precise flaw location 4.Big memory Digital Portable Ultrasonic Flaw Detector FD301Detailed Product Description Product Information:·Automated ... ((Depth d,level p,distance s)· Automated calibration of transducer Zero-point, Angles, Front edge and material Velocity · ... Parameter Measuring Range(mm)2.5 ~ 10000Measurement ModeSingle,Dual,ThruVertical Linearity Error≤3%Reject0~80%Horizontal Linearity Error ...