Half-Base Mechanical Depth Micrometer, Range 0 in to 3 in, Resolution 0.001 in, Accuracy +/-0.0001 in, Long Form Calibration Certificate No, Base Length 2 in, Base Style Half, Dimension Type Inch, Included Certification No, Mechanical Display Type None, Number of Measuring Rods 3, Operation Type Mechanical, Rod Diameter 5/32 in, Anvil Material Steel, Anvil Shape Round, Case Included Yes, Case Type Padded Case, Features Combination Ratchet and Speeder for Uniform Pressure and Quicker Adjustment