Digital Interchangeable-Anvil Micrometer Range 0 in to 4 in Resolution 0.001 in Accuracy +/-0.0001 in SPC Output No Long Form Calibration Certificate No Anvil Shape Flat Anvil Size 0.300 in Dimension Type Inch Operation Type Mechanical Thimble Type Ratchet Anvil Material Steel Case Included Yes Case Type Plastic Features Extremely Hard and Stable One-Piece Spindle Quick and Easy Adjustment Frame Material Cast Iron Includes 1 in 2 in 3 in Standards Lock Nut Type Ring