My ph probe is calibrated correctly 7.0 calibration at -23 and the 10 calibration is at 100% and my ph reading is at 8.0 but when using ph test kits 3 different brands and styles they all read 8.4-8.5 is something wrong that I’m missing? Carlos do you have a suggestion?
Ph Reading
- Thread starter Bobbywade
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Carlos I deleted the input like you suggested on someone else thread that was having the same issue. Without calibration of the probe after deleting it and adding it again it is reading correctly. So what might be the issue a bad probe? Cause after calibration is reads wrong?
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If the probe is reading correctly without calibration, then just leave it as is. That means the probe does not need calibration.
osvaldogarza21
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Dam... this was helpful I was having same issues my tank was reading 7.5 Ph, LFS tested and was giving me a reading of 7.8 Ph. I join the forum started reading and follow this instructions. Problem solved! 
Thanks Carlos we talked over email and deemed it a bad pH probe out of the box.