6" 150mm All Metal Digital Caliper Inch & Metric Electronic Digital Caliper offers instant and accurate readings of inside, outside, step, and depth measurements with accuracy of 0.001", SAE/Metric conversion switch automatically converts measurements to inches or millimeters with the simple press of a button, Adjustable thumbscrew provides tension for optimal movement of the slide and locks the jaws of the caliper in place, Includes a hard plastic storage case. Features