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Re: Anyone ever heard of Hanna Meters?

Hanna and Oakton produce a variety of industrial controllers.

I have a Hanna HI981411 pH controller (+/- 0.1 pH).  This is a panel mount
controller and costs about $100.  I bought it through Automated Aquarium
Systems.  I also have the Hanna Mini pH Checker.  You can get this fom
Aquatic Eco-Systems for $18.  Aquatic Eco-Systems has a good selection of
meters/controllers in their catalog if you want to see what's available
between $18 and $600.

All pH meters/controllers are as good as their calibration.  Every meter
I've tried tends to drift to reading high, that is it will read a pH higher
than the actual pH (for example reads 6.8 when pH is 6.4).  This gave me a
fatal CO2 overdose once.  I've found that if I calibrate and clean the
elctrode in the sump monthly, I'm ok.  I check the controller versus a pH
checker weekly as well.