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Re: PH Monitors

I have one of those Pinpoint PH monitors and I haven't calibrated it for
almost 1 year, and it's been in the tank and on the whole time (it's even
got algae growing on it).  One thing I found out is that you can't dip the
whole probe in the tank just the first 2"-3" otherwise the readings get
wacky.  Another thing is that it doesn't work well around my compact
flourescent lights/ballasts.  When I don't have any co2 in the tank it says
8.4, and when my fish are being co2 poisoned it reads 6.0 (that only
happened once) so I imagine it's in the ballpark, or if not at least as
close as I could read with a color comparing reagent method.