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直径仅为3.4mm的微型光谱共焦探头可以用于测量直径4mm以上的钻孔。探头由步进电机带动，稳定旋转。可以实现直径，圆度，同心度，锥度以及钻孔直线度等测量。
The miniature confocal sensor with a diameter of just 3.4mm can now be used to measure the internal walls of bore holes with a diameter of at least
4.0mm. The sensor, which is rotated by an electric stepper motor, can measure the diameter, roundness, concentricity, tapers and the straightness
of bore holes.
