3109-100A ELECTRONIC OUTSIDE MICROMETER 75-100mm/3-4" • Resolution:0.001mm/0.00005" • Buttons:on/off, data set, mm/inch, ABS/INC, data output • IP54 protection • SR44 battery, with one spare battery, auto power off • RS232 output, ratchet friction thimble, carbide tips  • DIN863 • With battery cover wrench and spare spherical anvil • Supplied with standard rods • Packed in plastic box or wooden box.