Electronic V-Anvil Micrometer Measure Diameter of 3 or 5 Fluted Tools Such as Taps, Reamers and End Mills. Features Include... 0.40" - 0.60" / 1-15mm Measuring Range 0.00005" / 0.001mm Resolution 0.0001" Accuracy 3 Flutes 0.250" Spindle Diameter Carbide tipped measuring faces Forged steel frame with enamel finish Ratchet thimble Spindle Lock Certificate of Calibration Furnished in fitted case