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I did throw in a caveat on the reliability...lol
As I recall, pH meters are logarithmic and not arithmetic in their differences, like the Richter scale. So 2 points is WAY off.
Below 7 and above 5.5 is why we correctly store and calibrate our pH meters.
LOL! Do as I say, not as I do.
At least when I calibrated my meter in the past, it seemed to be off the same amount in all the different solutions.
The post on making your own solution was several years ago.
Let me explain it in this way, by a story...
In the late 80's, I used to show American Quarter Horses on a semi-professional level. By that I mean that I showed against Pros that were employed by multi-millionaires that paid all the bills and just watched, rather than ride the horses themselves. I owned, rode, and competed against them, but on my own dime. The owners of the barn I rode out of were Jewish, and had fled Germany (him) and Russia (her) to escape the Nazis. They ended up in Argentina, where they met. Ironically, that's where lots of Nazis also escaped to after the war, but that's not the point. In Argentina, these people only had chicken to eat. They ate it every meal. They vowed that if they ever got out of Argentina, or were of better means, they would never eat chicken again. Obviously, they made it out of Argentina, and they kept good on their promise. To drive the point home even further, they would cook a chicken every other day and feed it to their dogs. In their words, "Chicken is dog food." My pH meter, and it use ,abuse, or lack of storage conditions, shows my utter distain for the monitoring of pH. My goal is to use a buffered substrate, find the proper balance of N sources, and never have to worry about pH or measure it. The only reason I have used it in the last 4 years is because people have asked me to check something.
on your own nute lineup!
1:1 ratio across the board.