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Well, you DID ask for the BEST test!

I bought this one: NutraFin Test Master Lab Kit at Big Al's Online

I'm pretty happy with it. Accurate enough results, good variety of tests, and nice case. The iron test is pretty much useless though. It is impossible to make an accurate iron test - no one has them. Don't sweat it. It isn't a necessary test anyhow.
 

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Unless you calibrate your test kits, all of the readings are kind of general. The lower the concentration of whatever you are trying to measure, the more important calibrating is. That's why phosphate tests are often wrong, and why iron tests are almost always wrong. (among other reasons.) Even nitrate tests should only be considered to give ballpark numbers if you don't calibrate the kit.
 

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You can also calibrate them by testing them against a known value. If you have dry ferts you can do this pretty easily. Mix up distilled water with ferts using Chuck Gadd's calculator to a known ppm in the mid range of your test kit. Make sure your test reads accurate. If it doesn't, then you'll know roughly how much your test kit is off by. Matching colors is horribly inaccurate any way you slice it though. If your plants are growing well, don't sweat the measurements too much.
 
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