A strong earthquake near the instrument will usually displace the reading off scale or may even damage the instrument.

如果在这类仪器的附近发生一次强烈的地震，一般就会使记录出格，甚至可能损坏仪器。

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Focusing eyepiece provides a sharp, easy-to-read scale, which is designed with semi-transparent blue background so you don't have to point the instrument in a certain direction to get your reading.

聚焦目镜提供了一个尖锐的，容易阅读的规模，这是设计的半透明蓝色背景，所以你不需要有指向仪在某一个方向使您读。

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