For many years engineers have counted on the tool known as a micrometer. First developed in the seventeenth century, the micrometer is used to measure extremely small distances in the fields of mechanical engineering and machining. The are different types of micrometer each made for a specific purpose, for instance, the outside micrometer, the inside or internal micrometer along with the depth micrometer. The micrometer is sometimes referred to as micrometer screw gauge, as it contains a calibrated screw, based on the variety of the micrometer this will determine the exact form of this screw.

The outside micrometer, also called the micrometer caliper, is used to measure a distance encased by the micrometer as the name suggests. In contrast to its opposite counterpart the internal micrometer, the outside micrometer enables you to measure objects such as wires, spheres, shafts and blocks. The micrometer works when it is placed around the object in question after which the screw is tightened. As with the depth micrometer, the outside micrometer features a series of precision markings upon the screw which indicate the measurement of the object with excellent accuracy and reliability.

The internal micrometer is employed to determine distances of things that the tool fits inside of. This micrometer is usually used to measure holes. To use an internal micrometer the screw is put within the hole to be measured and turned until the working parts have extended in an outward direction and fit tightly against the inside wall of the hole. The measurement scale printed on the outside of the screw will offer you an accurate measurement.

When you want to measure how deep a hole is, you will require a depth micrometer. This kind of micrometer is made up of the main body of the tool plus a metal shaft that extends and retracts, controlled by the screw. The body is placed on the flat surface with the metal shaft positioned above the hole to be measured. By turning the screw the shaft is extended until it is in contact with the base. The measurement scale on the screw will give you an accurate measurement.

Micrometers are generally found in engineering to determine precise measurements, even if measuring small distances. Internal micrometers along with other types of micrometer are often used when a conventional method such as using a measuring tape would not produce the level of accuracy. The accuracy of the depth micrometer as with all forms of micrometer lies within the construction of the screw which can be tightened and loosened to gain accurate readings. When the screw mechanism is produced to a high standard then the micrometer will produce very accurate measurements.