Mitutoyo Electronic Micrometer Head with Clamp Nut & Spherical Face on Spindle Features Include... 0 - 1" / 0 - 25.4mm Measuring Range 0.00005" / 0.001mm Resolution Spindle: Spherical (carbide tip) Stem Diameter: .375" Display: LCD IP65 Rated Protection Functions include... Preset, in / mm conversion Alarm: low voltage, counting value composition error