The mitutoyo 103 series outside micrometer set has a vernier scale in inch units for taking precise outside diameter (od) measurements, and a ratchetstop mechanism for uniform pressure during adjustment. The micrometer frame has a baked enamel finish for protection and durability. The vernier scale on the thimble and sleeve is graduated to 0.0001″, with a satin chrome rust and glareresistant finish. The spindle and anvil have flat measuring faces and are carbidetipped for wear resistance. A spindle lock helps provide secure locking of the measurement position. This set includes 12 micrometers in 1″ increments (0 to 1″, 1 to 2″, 2 to 3″, 3 to 4″, 4 to 5″, 5 to 6″, 6 to 7″, 7 to 8″, 8 to 9″, 9 to 10″, 10 to 11″, 11 to 12″), 11 standards in 1″ increments (1″, 2″, 3″, 4″, 5″, 6″, 7″, 8″, 9″, 10″, and 11″), one adjustment wrench, and a fitted box. specificationsdisplay typevernier scaleanvil/spindle styleflatgraduation interval0.0001″face materialcarbidetippedthimble styleratchet stop or friction thimbleflatness0.000024″micrometers are precision measuring instruments that use a calibrated screw to measure small distances. These measurements are translated into large rotations of the screw that are then able to be read from a scale or a dial. Micrometers are typically used in manufacturing, machining, and mechanical engineering. There are three types of micrometer: outside, inside, and depth. Outside micrometers may also be called micrometer calipers, and are used to measure the length, width, or outside diameter of an object. Inside micrometers are typically used to measure interior diameter, as in a hole. Depth micrometers 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. whats in the box?mitutoyo 103135 friction thimble micrometer, 0 to 1″ rangemitutoyo 103136 friction thimble micrometer, 1 to 2″ rangemitutoyo 103217 ratchetstop micrometer, 2 to 3″ rangemitutoyo 103218 ratchetstop micrometer, 3 to 4″ rangemitutoyo 103219 ratchetstop micrometer, 4 to 5″ rangemitutoyo 103220 ratchetstop micrometer, 5 to 6″ rangemitutoyo 103221 ratchetstop micrometer, 6 to 7″ rangemitutoyo 103222 ratchetstop micrometer, 7 to 8″ rangemitutoyo 103223 ratchetstop micrometer, 8 to 9″ rangemitutoyo 103224 ratchetstop micrometer, 9 to 10″ rangemitutoyo 103225 ratchetstop micrometer, 10 to 11″ rangemitutoyo 103226 ratchetstop micrometer, 11 to 12″ rangeeleven micrometer standards in 1″ increments (1″, 2″, 3″, 4″, 5″, 6″, 7″, 8″, 9″, 10″, and 11″)adjustment wrenchfitted case.