Another useful link for constructing electronic pH meter.

http://www.lce.org/equipment/phmeter/phmeter.html

And make yourself some pH electrodes

http://www.lce.org/equipment/phmeter/electrodes.html

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Life without chemistry would be a mistake.

http://www.lce.org/equipment/phmeter/phuse/phread.html

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(rated as:eggsellent)

$30-$50 bucks for a submersable digital that will read to the nearest tenth.  Why fuck around?
remember to pick up some solution to give it a good cleaning every now and then (deposits can form even if its stored correctly with deionized h2o).  Those little buggers will last YEARS if you take care of them properly.

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i FEEL funny.

Excellent link(s)!

SWiSD will begin immediatly.

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Cops;100% chicken,on styrofoam,wrapped in plastic. Just plain old Fowl

i won't say where, but an excellent mushroom growing resource company also sells chep ph meters.
cy

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So you need a precursor to a pecursor, just to make a precursor