Ph Controller

[wobbles]

Hi. Is there a big difference between cheap ph controllers and expensive? For example, do you think this one is any good?


http://cgi.ebay.com/DIGITAL-PH-CONTROLLER-ELECTRODE-SOLUTION-CO2-220V_W0QQitemZ330215621219QQihZ014QQcategoryZ20754 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[ILLUSN]

I've got one at home just like that, i also got it from ebay, so far so good i re calibrate it every 2 weeks and its never out by more than 0.2 (by ph pen and test kit)

just keep an eye on it for calibration drift.

[wobbles]

How does it take CO2 reading without KH as well? Does it assume the correct amount of buffering?

[ILLUSN]

it doesnt take a co2 reading, just ph, when too high it turns co2 on when too low it turns it off.