Mechanical Spherical Micrometer Range 2 in to 3 in Resolution 0.0001 in Accuracy +/-0.0002 in SPC Output No Long Form Calibration Certificate No Anvil Shape Spherical Anvil Size 0.256 in Dimension Type Inch Operation Type Mechanical Thimble Type Ratchet Anvil Material Carbide Case Included Yes Case Type Plastic Features Carbide Measuring Faces Measure Wall Thickness Of Tubes Includes Hard Plastic Case Lock Nut Type Lock Nut Maximum Measurement - Inch 3 in