白熊 wrote: 呀陸, 支批係要黎calibrate用, 如果用蒸餾水測試時唔係"0"既話, 攞走粒"黑色膠粒"會見到有粒螺絲仔, 教到佢去"0", 正常情況下, 每一年半年先要cal一次... 使用好簡單, 用吸管吸一D水, 再注o向塊藍色玻璃上, 翻下透明蓋, 跟注好似單桶望遠鏡咁用眼睇, 會見到有一條"藍色及白色"既分隔線, 对應有個刻度表....其實好似用, 幾歲既細佬都會用.....好方便.... cmtsui, 係全新既....仲有serial no. ....不過個no.我都唔知要黎做乜
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