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The Mitutoyo 293-831 Digimatic MDC-MX digital micrometre is for taking outside diameter measurements. The micrometre has a measurement range of 0 to 1.00 to 25.4mm resolution of 0.000050.001mm and an accuracy of + or – 0.00010.002mm. The LCD screen displays in inches and metric units. This micrometre has a ratchet stop to help provide uniform pressure for precise repeatable measurements. The measuring faces are flat and are carbide-tipped for durability. This unit turns off after 20 minutes of idle time and can be turned on by twisting the spindle for convenience. Additional functions offered by this micrometre include zero setting and alarms for low voltage and counting value composition errors. The measuring force is 5 to 10 Newtons N. It has a battery life of approximately 1.2 years of normal use. This unit comes with a SR-44 battery and fitted plastic case. Micrometres are precision measuring instruments that use a calibrated screw to measure distances. These measurements are translated into large rotations of the screw that are then able to be read from a scale or a dial. Micrometres are typically used in manufacturing machining and mechanical engineering. There are three types of micrometre: outside inside and depth. Outside micrometres may also be called micrometre callipers and are used to measure the length width or outside diameter of an object. Inside micrometres are typically used to measure interior diameter as in a hole. Depth micrometres measure the height or depth of any shape that has a step groove or slot. Mitutoyo manufactures precision measuring tools metrology equipment and related systems. The company founded in Tokyo in 1934 formed Mitutoyo America Corporation in 1963 with headquarters in Aurora IL.