Digital Caliper Measuring Tool 150mm / 6"6" 150mm Stainless steel vernier caliper measuring tool with large LCD display Accurately measure the inner diameter, outer diameters, step length and depth of an object Uses large stainless steel jaws for outer diameter measurement Measure the inner diameter of any object with the small stainless steel jaws Use the end of the caliper to measure the depth of on object Measure the step length of the object use the groove on the back of the caliper