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post #1 of 11 (permalink) Old 01-07-2007, 02:40 PM Thread Starter
 
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best test

i need a test kit that test for everything all i have is quick dip strips, and phospate test kit...

what do you recommend??
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post #2 of 11 (permalink) Old 01-08-2007, 02:16 AM
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This spectrophotometer works well. SMART¬ģ Spectrophotomer by LaMotte This Smart2 colorimeter works well and it's a little cheaper: LaMotte SMART Colorimeter
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post #3 of 11 (permalink) Old 01-09-2007, 01:26 AM Thread Starter
 
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holy cow!! lol, well, that's like $1600 bucks out of my price range, i was talking about something more simple, thanks for that suggestion though..
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post #4 of 11 (permalink) Old 01-10-2007, 09:37 PM Thread Starter
 
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any more suggestions, affordable ones? lol
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post #5 of 11 (permalink) Old 01-10-2007, 09:44 PM
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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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post #6 of 11 (permalink) Old 01-13-2007, 07:17 PM Thread Starter
 
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are the nitrate test readings precise or kinda general like those 5 in 1 quick dip strips.
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post #7 of 11 (permalink) Old 01-13-2007, 07:54 PM
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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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post #8 of 11 (permalink) Old 01-14-2007, 10:56 PM
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How do you calibrate a test kit?

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post #9 of 11 (permalink) Old 01-15-2007, 11:08 PM
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Seeachem's Nitrite/Nitrate and Phosphate test kits come with reference solutions.
Nitrite/Nitrate: MultiTest: Nitrite/Nitrate
Phosphate: MultiTest: Phosphate
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post #10 of 11 (permalink) Old 01-16-2007, 09:54 PM
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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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post #11 of 11 (permalink) Old 01-20-2007, 09:03 PM
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Thank you. Once I get some ferts I'll try it.

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