通常指安装在望远镜上的一种附件，用来测量微小的角距，以提高观测精度。
n. micrometer ; MICRON
会使用量具，例如螺旋测微器，卡尺等。
Use of precision measuring tools, such as micrometers, calipers, etc.
用螺旋测微器测量水准仪平移的距离，从而得到钢丝长度的微小变化值。
The small variation of the steel-wire's length can be obtained by measuring the displacement of leveling bench with micrometer.
度盘测微器系统误差是影响度盘对径改正精度和度盘位置测定精度的重要因素。
The systematic error of the circle reading micrometer is an important factor to influence on the accuracy of the diameter correction and of the position measurements of the circle.
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