I have two Bluelab PH Controllers - I can calibrate them both at the same time - and then afterwards they will read different. It's fucking driving me nuts.
Like wtf - for 400 bucks you think you'd get quality - or maybe it's just impossible to get it the same. Either way - I think the old probe on my 4x4 was giving me higher PH readings - which may have lead to my problems with the Event Horizon this run. I noticed it wouldn't calibrate PH 10 (error) so I replaced the probe. The stock solution read .3 or .4 over - so instead of 5.8 where I thought it was, it was around 6.1 - 6.2.
- Follow up-
So - just talked to BlueLab - they said .1 or .2 variance is within range and acceptable. They are sending me a brand-new probe on the house because the 3-week-old one I had was actually 2-3 years old - apparently their distributor was stockpiling them.
So running that high PH (6.1 or even 6.3 with the autopot PH drift up) - could have caused that high stress with the Event Horizon - explaining the leaves that were wavy as well