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01-03-2005, 05:14 PM | #11 |
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oic. i got it wrongly. yours is the PH pen which is meant to be discrete usage. i thought it was a PH monitor with seperated probe which runs 24/7 constantly.
if PH monitor for $36, definitely die die must buy. but anyway $36 for a PH pen is a good deal as well. |
01-03-2005, 05:16 PM | #12 | |
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Actually ur sec school tech is right, the proper way shld be to calibrate everytime after use. Prob is, we dun have the means $$$ to do that everytime. Heard from bros here that they have used distilled water to calibrate too...........not too sure abt the results though. |
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01-03-2005, 05:49 PM | #13 | |
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01-03-2005, 05:51 PM | #14 | |
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01-03-2005, 05:51 PM | #15 | |
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01-03-2005, 06:00 PM | #16 | |
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02-03-2005, 01:17 AM | #17 | |
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I read the instructions of the Hanna box, it says it cannot be used to store the test pen because it is non-ionized (how does it affect actually, these ions?), no mention about calibration can use or not.. better dun take this kind of risk... |
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02-03-2005, 01:34 AM | #18 |
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can use boiled water instead of distilled water???
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02-03-2005, 01:42 AM | #19 | |
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Boiling won't completely remove all these leh... Btw i tested tapwater, it was pH 8.0 yesterday and 7.2 today. Weird. Datz almost a 100 times difference! |
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02-03-2005, 01:44 AM | #20 | |
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Oh ok... Very hard for people like me to get distilled water leh... Unless buy from supermarkets... I think i have seen bottles of distilled water for sale in ntuc before... |
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