Westward 4-Way Vernier Caliper 4KU77 Features Vernier calipers have a fixed jaw paired with a sliding jaw that moves along a graduated scale to take inside and outside measurements. The jaws are used to contact the opposite sides of an object, workpiece, or feature. Operators read the main and vernier scales and add the values together to determine the reading. These calipers require expertise to read correctly. Range / 0 inch to 6 inch; 0 mm to 150 mm Graduations / 0.001 inch Accuracy / +/-0.001 inch; +/-0.03 mm Caliper Material / Hardened Steel Dimension Type / Inch/Metric Graduations - Lower Scale / 0.001 inch Graduations - Upper Scale / 0.02 mm Jaw Actuation Type / Slide Jaw Depth / 1-3/4 inch Maximum Measurement - Decimal Inch / 6 inch Maximum Measurement - Fractional Inch / 6 inch Maximum Measurement - mm150 mm Measurements / 4-Way Measures Depth / Yes Measures Inside Dimension / Yes Measures Outside Dimension / Yes Measures Step / Yes Minimum Measurement - Decimal Inch / 0 inch Minimum Measurement - Fractional Inch / 0 inch Minimum Measurement - mm / 0 mm Case Included / Yes Case Type / Plastic Depth Rod Shape / Rectangular Finish / Satin Chrome Jaw Depth - Upper Jaw / 0.63 inch Jaw Shape / Knife-Edge Jaw