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Meters?

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Hello all 

Can anyone tell about those little (cheaP 10-20$) meters
for doing NPK or PH testing.  
Do they work at all?  Okay but crude?  Really great?
I have amended my soil (clay) 12 ways from sunday.
City provided compost (should have sifted it)  my
own compost, vermiculite, some ashes, some peatmoss.
But each bed was made at a different time and was
amended differently.  I have already noted that
tomatoes work better in one bed then in the next
bed 4 feet away.  So I want to test my beds.  
I don't care if the accuracy is not accurate to
n decimal places.  A simple PH acurate to a whole
number or NPK close to 10% of real would be good
enough.  Providing bags to the local University
to do the tests sounds cost prohibitive. 
So what can you tell me about these meters?
And/Or compare them to the test tube chemical
kits I have seen on the market?

Thanks in advance for any replies.  - Ron Souliere
(Lincoln, Ne  2 4x8 beds going on 3) plus assorted
containers strewn about the lawn or on fence posts...


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