qeezur - 4-3-2015 at 07:40
so i am going to buy a PH meter, i intend to use it to monitor PH sensitive reactions such as azoic coupling etc ... now i am confused because the
seller is asking me to choose between ORP and PH probe ...
which one should i go for if i only want to see the PH values ...
also he is offering me another one which includes an ATC probe ...
what should i go for ?
Sulaiman - 4-3-2015 at 08:27
I'm no expert but I believe that an ORP is mainly for water quality when contaminant levels are low, so you probably want a pH probe.
Measured pH depends on temperature so ATC would be best.
Molecular Manipulations - 4-3-2015 at 09:09
Definitely get the pH (not PH
) meter. <s>ORB</s> (typo, meant ORP)
probes don't measure pH at all but rather oxidation-reduction potential, which isn't what you want. The seller probably thinks you want to check the
purity of water, which pH and <s>ORB</s> ORP can do, in completely different ways.
"ORP is a measure of the cleanliness of the water & its ability to break down contaminant". ORP level can also be viewed as the level of bacterial
activity of the water because a direct link occurs between ORP level and Coliform count in water.
This is not what you want.
Thanks Sulaiman ↓↓↓!
[Edited on 4-3-2015 by Molecular Manipulations]
Sulaiman - 4-3-2015 at 09:11
you probably don't want an ORB probe either 
I have two of these that seem ok
http://www.ebay.co.uk/itm/LCD-Digital-Pocket-Pen-Aquarium-Po...
[Edited on 4-3-2015 by Sulaiman]
qeezur - 4-3-2015 at 12:23
sulaiman and moleculcular manipulations,
thankyou guys ... i am going for a benchtype ...
anything else to check ? electrode etc ? any word of caution