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

[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.