Siu Fung,
let me try from tomorrow for several attemps a day from time to time, thanks for your reply.
Miffy, you have just wake me up! Maybe is it wrong if I don't soak by a container/bottle? I used to "wet" the test paper by pp for 5 second only (in office always not convenient to do this test by bottle) (原來我一直都用錯方法）
(原來我一直都用錯方法）
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