Mitutoyo Electronic Micrometer Head with Non-Rotating Spindle Features Include... 0 - 1" / 25.4mm Measuring Range 0.00005" / 0.001mm Resolution Spindle: Flat Stem Diameter: 0.5" / 12mm Display: LCD IP65 Rated Protection Non-Rotating Spindle Functions include... Preset, in / mm conversion Alarm: low voltage, counting value composition error