| 摘要 |
The present invention relates to a measuring instrument, and this measuring instrument comprises a main frame for axially movably supporting a spindle, a first tubular member having loosely inserted thereinto an engageable member projected from the spindle so as to axially move the spindle, a second tubular member coupled onto the first tubular member and having an elongate groove having inserted thereinto the engageable member, an outer tube coupled onto the second tubular member hand having a spiral groove engaging the forward end of the engageable member and a displacement value detector for detecting a displacement value of the spindle in the axial direction thereof, and the spindle is made linearly movable through the rotation of the outer tube.
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