The dial gauge is a frequently used instrument for the measurement of small deviations relative to a datum surface . A dial gauge consists of a spindle that moves inside a cylindrical tube. The linear motion of the spindle is translated into rotation of a shaft is made to move over a graduated circular dial.
In a different design, known as the lever type, the spindle is replaced with a stylus. The up and down motion of the stylus is translated into the rotary motion of the pointer. A wide variety of dial gauges of different ranges, usually up to about 100mm, and best resolution of 0.002mm are available.
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