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Old 09-19-2008, 05:25 PM   #11
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As Kurt stated it is not a matter of actual numbers accuracy as it is interpreted accuracy. Test strips could be used in emergency situations or even new shipment arrivals where you need to know if there is NH3 or NO2 present prior to acclimation and remedy; however, detailed results are left to the imagination. Liquid tests, imo, are better by far, but does not stipulate a proper readout in the final "drop" phase. In other words, how much of that final drop was overkill or even underkill? If you can, use a color wheel over block cards. The final outcome is guesstimation based on perception once again. Titration is better if using syringe method, but still there is a % of error (from what I've been informed, around 10%). Personally, as long as it is serviced, reagents are properly stored, and your blanks are standardized, I prefer digital and if you can afford...Spectrophotometer.
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Old 09-19-2008, 05:31 PM   #12
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James, can I borrow your Spectrophotometer?
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Old 09-19-2008, 11:50 PM   #13
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James, can I borrow your Spectrophotometer?
Heh, sure, buy me one and I'll let you borrow it! :P
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Old 09-20-2008, 12:09 PM   #14
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Ah, one more thing to add to the "if I win the lottery" list. Oh wait. That's already on there.

I find it interesting that I can read the API pH test easily but not most others (color blind in the blue-green range).

I mostly use Salifert or LaMotte, but even they have a margin of error based on hwo carefull you are in filling the test vial, syringe and mixing between drops. I don't think a single drop difference is that great, but fillinng the syringe could be.
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