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Re: Hagen Test kits
"The other thing is the pH, did you get the wide range kit, or the low
high range pH kits? the wide range one is ok, the other two are a bit shaky
where they cross over, at pH 7 or so."
Not to stick up for Hagen, but I think that you'll find that pretty much
true for _all_ test kits, regardless of parameter or manufacturer. Test kits
are most accurate in the middle of their range, approach the limits, either
way, and they lose accuracy. You would almost need 3 pH kits, low range, mid
range, and high range if you regularly find yourself testing waters which
differ greatly in pH.