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A micrometer sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, anddigital calipers. Micrometers are often, but not always, in the form of calipers.Micrometer is a measuring instrument used in precision manufacturing industry. Compared to other measuring instruments like Vernier Calipers, a micrometer can give much precise measurements. Micrometers are a modified version of screw gauges. This original measuring equipment is less accurate and has its drawbacks. Today’s micrometers are equipped with digital readings and can measure dimensions as accurate as 0.001mm.Basic typesLarge micrometer caliper.Another large micrometer in use.The topmost image shows the three most common types of micrometer; the names are based on their application:Outside micrometer (aka micrometer caliper), typically used to measure wires, spheres, shafts and blocks.Inside micrometer, used to measure the diameter of holes.Depth micrometer, measures depths of slots and steps.The  micrometer  is  a  precision  measuring  instrument used   to   measure   distances between   surfaces   in thousandths  of  an  inch  Figure  2-4  shows  the  most common types of micrometers. Most micrometers have a frame, anvil, spindle, sleeve, thimble, and ratchet stop. Micrometers  are  used  to  measure  the  outside diameters;  inside  diameters;  the  distance  between parallel surfaces; the depth of holes, slots, counter bores, and recesses; and the distance from a surface to some recessed part. A micrometer is a very important tool that will be of great use in measuring dimension of many objects with great accuracy and precision. There are many new varieties of micrometers that are available in the market. The electronic model that provided automatic reading of the object in a great manner offers wonderful usage for many people. The handling of this instrument can also be done in an easy and flexible manner.High quality stainless steel is being used to make this part to assure wonderful and high level durability. The pitch scale and the head scale readings will be properly accounted and digital readings will be provided in an easy manner. This precision micrometer can be used to take variety of readings such as diameter of outside bore, inside bore and many more. You can also use special attachments to measure other complicated readings.Micrometer is also used for outside measurementThe most common application for micrometers is the measurement of length dimensions between two parallel end surfaces on the outer side of an object or feature. This is currently known as external or outside measurement. The micrometer is a convenient instrument for outside measurements because 1) it supplies promptly the desired size information; 2) it has a relatively wide range of measurement ( for example, 10,000 times the least increment of its scale ); 3) its use does not require specialized skill; and 4) the measuring tool is easily adaptable to diverse object forms. These and many other advantages account for the wide application of micrometers in production and inspection.It is a logical consequence of this extended field of potential applications that outside micrometers are required and made in many varieties of sizes, forms and accuracy grades.The size of a micrometer refers to the limits of its measuring range . The most common size is the one-inch size, which permits measurements over a range from zero to one inch in length. The same range of one inch can also be applied to other limit dimensions by mounting the basic screw mechanism on other frame sizes . Accordingly , outside micrometers are also made in sizes of 1 to2 inches , from 2 to 3 inches, and so on to a 24-inch maximum limit, exceptionally even larger . Because micrometers whose lower range limit is greater than zero cannot have direct contact between spindle face and anvil, setting masters must be used for calibration purposes. These setting gages, also known as standards, must be a size equal to the lower limit of the micrometer’s measuring range, and are usually procured together with the micrometer.The larger size micrometers are available in sets, complete with standards , generally in cases with individual compartments , permitting micrometer measurements over a wide range of lengths , from zero up to the maximum size of the largest instrument in the set.