A device for measuring very small distances,objects,or angles,especially one based on the rotation of a finely threaded screw,as in relation to a microscope.

• 测微计，千分尺用以测量非常小的距离，物体或角度的仪器，尤指显微镜上利用精细螺纹的螺杆的旋转进行测量的仪器。