在使用不同的距离按两根手指时，请注意 TouchPad 如何获得零触点以及 X 和 Y 坐标读数。

Notice how the TouchPad picks up zero fingers, as well as the X and Y coordinate readings when pressing two fingers at widely varying spaces.

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最后，在完成每次取样和净化顺序后，必须借助于水游离度测量来校正测量仪器的零点，以确保可以进行下一个读数。

Finally, after each sampling and cleaning sequence the measurements’ zero point ischecked with a water freeness measurement to make sure the next reading isrepeatable.

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在几秒钟内，表针的读数应为零。

Within seconds the meter hand should read zero.

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