what's with having to calibrate test kits ? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-15-2015, 05:17 PM Thread Starter
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Question what's with having to calibrate test kits ?

Well I've been diligent about testing my water for years now , to only learn in the last couple of days that my api nitrate kit needs to be calibrated. What's up with that ?. Is there an easy way to do this.


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post #2 of 4 (permalink) Old 03-15-2015, 05:29 PM
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Quote:
Originally Posted by rick dale View Post
Well I've been diligent about testing my water for years now , to only learn in the last couple of days that my api nitrate kit needs to be calibrated. What's up with that ?. Is there an easy way to do this.
Need? Depends I guess. I did the calibrate thing just to make sure I was interpreting the colors right. Hoppy did a nice write up on the instructions.
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post #3 of 4 (permalink) Old 03-16-2015, 02:44 AM
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API test kits, while in general are quite precise (good repeatability between measurements), are sometimes inaccurate (measured values differ from true values). This is why calibration is recommended.

Anthony


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post #4 of 4 (permalink) Old 03-16-2015, 03:30 AM
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Any device or kit that is used to measure something can become inaccurate for various reasons. Chemical test kits may be the most prone to becoming inaccurate, since the chemicals used in the test may deteriorate with age or storage conditions, and the techniques for using the test kits may be more important than we assume. This is of no importance if you are measuring stuff just for the fun of doing it, and to get a rough feel for the values of what you are measuring. It is when you are making important decisions about your fertilizing, for example, that you need to be sure the test results you are getting mean what you think they do. For those situations you need to calibrate the test kits before trusting their results.

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