... (steel) 2,Sound Velocity Range: (1000 ~ 9999) m / s LK300 Ultrasonic Thickness Gauge1. Suitable for measuring metal (such as steel, cast ... , ceramic, glass, glass fiber and other any good conductors of ultrasonic thickness.2. Can be equipped with different frequencies, different sizes ... )the whole with : thickness gauge, probe, alloy case, certificate of inspection, operation instruction manual.