The device is attached to a water bottle, and it monitors the clarity inside the bottle, blinking when the light is obstructed by particles.
这种装置放在水瓶上，用来检测瓶子内部的透明物，一旦光线被杂质阻挡了，它就会闪烁。
When there are no longer particles floating around, the light stops blinking and you have 99.9 percent clean drinking water.
当四周没有漂浮的杂质微粒时，光线就会停止闪烁，然后你就可以得到99.9%的纯净水了。
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