测角仪器，测量角度的光学器具。用于测定目标方位角、角低角，赋予火炮和观瞄器材基准射向，连测炮兵战斗队形，建立火炮控制网。
借助高精度的测角仪器，就可测量棱镜的顶角和最小偏向角，从而得到光学玻璃的折射率。
With the help of a precise angle-measuring device, the apex Angle and the minimum deviation Angle of the prism can be measured; hence the optical refractive index of the glass.
数字光栅测角仪是一种新型的角度计量仪器。
The digital and grating instrument isanew kind of instrument for measurement of angle.
此种罗盘可用于各种海流计上作为测向传感器，也可用于其他需测方位角的仪器上。
Being used as a current direction sensor, this compass is suitable for all kinds of current meters required by measuring direction.
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