PH--- Is it better

A

aces15224

Member
to stick the Ph meter directly into the reservoir for readings or to isolate a sample and then try for a reading? I have been noticing that there is a few point difference in each of the methods. Is there any criteria for taking a reading? I'm using a Checker by Hanna digital meter.
 
A

aces15224

Member
I see that my the Hanna Checker is notoriously crappy. My two questions still stand though....for future reference.
 
Stoobie

Stoobie

Well-Known Member
I usually have air moving in my reservoir, so I take a sample and check it. If your solution is moving, the pH should be pretty consistent throughout. If you take a good sample in a clean container, the pH should be exactly the same as in your reservoir. That said, many pH pens, particularly the inexpensive ones, tend to have some variations on the same sample.
 
A

aces15224

Member
I understand there may be some fluctuation in the readings. However, the readings are big. When I put the meter into the reservoir I get a reading of about 4.5-4.8. When I isolate a sample I get about 6.9-7.10
 
Neumann

Neumann

Active Member
aces15224 said:
I understand there may be some fluctuation in the readings. However, the readings are big. When I put the meter into the reservoir I get a reading of about 4.5-4.8. When I isolate a sample I get about 6.9-7.10
Click to expand...
I pull a sample in a clean vial big enough for my meter to sit in. I let my meter sit in solution for about 90-120 seconds to make sure it's dead nuts.
 
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