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Originally Posted by iapetus  It's important that we think about the limits of our testing equipment when we use it. The way these aquarium tests work don't provide error bars and they have limitations. A color that I think closely matches 0 ppm of ammonia might be interpreted by someone else to read 0.25 ppm of ammonia. So, the subjectiveness of these API tests is another weakness of them. They're good guides, but they're imprecise. |
I have to agree with you iapetus in that these tests, whether they are dip strips or chem tests with drops, are just basic guide lines. I've use them both and sometimes the wife and I can slightly dissagree about the color results. We figure as long as we are really close and every thing is well within its specs then we are ok.