... ~ 300) mm (steel) 2,Sound Velocity Range: (1000 ~ 9999) m / s LK300 Ultrasonic Thickness Gauge1. Suitable for measuring metal (such as ... , glass, glass fiber and other any good conductors of ultrasonic thickness.2. Can be equipped with different frequencies, different sizes ... -contrast LCD display code segment, high-brightness EL backlight; Measurement Range: (0.75 ~ 300) mm (steel), metric and imperial ...