General Vernier Caliper delivers accuracy and precision without cutting into your budget Solid steel design provides a range of 12.7 cm and can take outside, inside and depth measurements Smooth-action thumb roller allows you to dial in on the correct measurement by advancing and retracting the slide with precision Features a frame lock for taking repetitive measurements High-quality vernier caliper provides both Metric and English readouts as small as 1/128 inch (0.1mm), and the slide bar is graduated in 1/16th inch and 1 mm increments