Fowler 52-008-007 Stainless Steel One-Rev Dial Caliper, 1.6" Jaw Depth, 0-6" Measuring Range, 0.001" Graduation Interval, Face Color White Dial graduations of 0.001", with one revolution equivalent to 0.100" Hardened stainless steel construction for corrosion resistance and long life Knurled lock screw holds the sliding jaw in position to help ensure a consistent measurement Covered rack to prevent dirt and debris from clogging the gear, and to help prevent measurement errors Thumb-operated fine adjustment roller for one-handed use