LEMONBEST New 150mm 6" Electronic Digital LCD Steel Vernier Caliper Metric Conversion Accuracy Gauge Micrometer Hand Tool with a Black Box Base measuring function: Inside, outside, depth and step measuring. With a small locking thumb screw which locks the jaws in place. Zero setting in any position. LCD display, easy to operate, one button to switch between inches to mm; Auto switch OFF. Measuring range: 0-6 Inches or 0-150mm; Resolution: +/- 0.01mm/ 0.0005" Ideal for use in electronics, Jeweler, mathematicians, scientists, Crafts etc.