ph probes, test kits, oh my!!!!

[kengeroo]

So I am pulling my hair out

my new apex ph probe is reading 7.91

while my seneye is reading 8.12

hagen ph hest kit 8.3
api test kit reads 8.2


I have calibrated the apex with pinpoint 10, 7 calibration fluid,, twice ...

any suggestions ?

[e46er]

i wouldn't be overly concerned.

most people don't check their PH at all if they don't have a probe.
your in the ballpark so dont worry

[kengeroo]

but when you spend over 1k on apex gear,, you'd expect it to match up with at least 1 out 3 other ph tests..

[Craigdillman]

Originally Posted by kengeroo

but when you spend over 1k on apex gear,, you'd expect it to match up with at least 1 out 3 other ph tests..

True

[Myka]

Originally Posted by kengeroo

So I am pulling my hair out

my new apex ph probe is reading 7.91

while my seneye is reading 8.12

hagen ph hest kit 8.3
api test kit reads 8.2


I have calibrated the apex with pinpoint 10, 7 calibration fluid,, twice ...

any suggestions ?

First suggestion: Throw out the Hagen and API kits and remove them from the equation. A pH test kit is fairly useless if you want to get within 2 points. Considering you calibrated the Apex probe, I'd be inclined to believe that the most. I'm not sure how Seneye usually compares.

I agree with e46er, you're within range, so I wouldn't be too concerned.

[gregzz4]

I agree with the other replies
Have you checked the apex and seneye in new 7 and 10 fluids, after calibration?
Also, stray current and electrical fields can skew pH probe readings. Try putting some tank water in a glass and test that with the probes, but 1 at a time.

[Myka]

Originally Posted by gregzz4

I agree with the other replies
Have you checked the apex and seneye in new 7 and 10 fluids, after calibration?
Also, stray current and electrical fields can skew pH probe readings. Try putting some tank water in a glass and test that with the probes, but 1 at a time.

Good advice.