PH Monitor/Controllers

[loupgarou]

Any recommendations + prices?
I saw some made in ROC for 107 even.. (ph monitor) are they reliable at all?

or should I just stick to a ph pen?

[PeterGwee]

MMMmmmmm...not really reliable imo. pH probes accuracy deteriorate with time..(what is the duration the probe has been lying in the shop from the date it was manufactured?)...Better get a test pen..calibrate when you need to measure rather than recalibrating the pH controller's pH probe every now and then to prevent inaccurate reading thus overdose of CO2!

[loupgarou]

Found a great one.

http://www.aquabotanic.com/abstore/index.html

Milwaukee SMS122 pH controller at USD105...

cheaper than any solution in singapore so far.