Fowler 54-870-003 Xtra-Value II Electronic Micrometer with Grey Enamel Finish, 2-3"/50-75mm Measuring Range, 0.00005"/0.001mm Resolution, 0.00016"/0.004mm Accuracy, RS-232 Output Digital outside micrometers with a choice of measuring range and flat anvil/spindle pair for general purpose measuring LCD performs direct inch/metric conversions and has a switchable resolution of 0.00005" and 0.001mm Ratchet thimble applies consistent force for repeatability between users Absolute and incremental modes provide a choice of measurement types RS-232 output provides ability to export readings to a computer (cable not included)