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The Sirius external disk micrometre has a measurement range of 0mm to 25mm with an accuracy ±0.001mm. This is high tech, battery-operated device. It has metric reading capabilities and resettable origin point. Features and Benefits • Features and Benefits • Resolution of 0.001mm • Battery operated • Easy operation • Display data is origin data of absolute measurement after charging battery • Painted frame is a carbide measuring faces • Ratchet friction thimble