3104-55 DOUBLE DISPLAY ELECTRONIC OUTSIDE 25-55mm/1-2.2" • Double sides display, in two directions • Resolution:0.001mm/0.00005" • Buttons:on/off, data set, mm/inch, ABS/INC, LCD direction change • IP54 protection • CR2032 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.