LS211 Linshang ultrasonic thickness gauge for measuring large thickness materials

How to measure the thickness of such a thick material?
Use Linshang LS211 ultrasonic thickness gauge.
Set the sound speed corresponding to the material.
Apply couplant on the surface of the material.
Press the probe tightly and the test results will come out.
To measure materials with large thickness, choose Linshang ultrasonic thickness gauge.