Fowler Extended Range Dial Caliper Specifications Include... 0-24" Measuring Range 0.001" Graduations Depth of Jaws: 3.375" Features include... Dial hand completes one revolution per each .100", large dial easy to read graduations Inverted covered rack prevents dirt accumulation in rack gear teeth. Self-contained movement eliminates gear misalignment. Exclusive dual pinion drive mechanism reduces wear on rack and pinion Beam graduated in .100" increments Thumbroll for rapid setting Hardened stainless steel throughout with measuring faces precision ground and microlapped for exceptional accuracy Depth rod Knurled lock assures precise settings Adjustable dial reads directly to .001"