General Tools 143 English and Metric Digital Caliper, 6-Inches The 6 inch Digital Caliper is an ideal choice for hobbyists and do-it-yourselfers, offering precision measurements at a modest price The fiberglass-reinforced plastic body allows you to take inside, outside, depth and step measurements with ease The direct-reading digital display provides measurements in both inches and millimeters, and is accurate to .001" (.1mm) Free-wheeling friction roller advances and retracts slide; Direct reading to .0005" (.01mm) Easy-to-read digital display with switching between inches and millimeters; Adjustable zero feature