...机的AB两端设计了两个可改变角度的折射镜，当转动镜头的对焦环（即改变镜头的聚焦点）时，这种运动量会通过测距臂（feeler arm）传到测距器上，并带动AB两端的折射镜转动。
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Be sure nothing interferes with the sweep of the feeler arm.
确保探测臂摆动时无阻碍。
The probe can be penetrated into a coating until the bottom part of the coating through the compressive force effect of the feeler arm.
探测杆在压力作用下促使探针刺入涂层直至涂层的底部。
If valve clearance needs to be adjusted, loosen the locknut on rocker arm adjusting screw. Turn adjusting screw until feeler gauge slips with a slight drag.
如果气门间隙需要调节，松开摇臂调节螺丝上的防松螺母，转动调节螺丝直到测隙规滑动时稍带阻力为止。
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