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养鱼需要定期换水，该设备表盘有30个刻度，记录30天，附带的pdf有表盘用A4直接打印贴在上面就行哪天换的水就就把日历盘转到那一天，以后哪天换的水一目了然，也可以转成下次换水的时间，当天该不该换水也很清楚内有棘轮结构，需要配套旋钮才能转动，怕被人篡改时间就把旋钮收起来，就没人转的动了
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