The solid steel design on this vernier caliper provides a range of 5" (125mm) and can take outside, inside and depth measurements.  The smooth-action thumb roller allows you to dial in on the correct measurement by advancing and retracting the slide with precision.  There is also a frame lock for taking repetitive measurements.  This high-quality vernier caliper provides both Metric and English readouts as small as 1/128" (.1mm), and th slide bar is graduated in 1/16" and 1mm increments.