LK300 Ultrasonic Thickness Gauge 1,Measurement Range: (0.75 ~ 300) mm (steel) 2,Sound Velocity Range: (1000 ~ 9999) m / s LK300 Ultrasonic Thickness Gauge1 ... interference electromagnetic interference (EMI) electromagnetic interference (EMI)the whole with : thickness gauge, probe, alloy case, certificate of inspection, operation instruction manual.