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Lew, the nute's self-buffering is in reference to the solution it makes, but not the soil/medium that it's in,.. it can help some, but it's not the end of pH management I'm afraid, especially in soil, soilless mediums, or coco ...the plant roots, microbes, other nutrients/supplements all are sources of input and change,... thanks for the better pics! I see some tip clawing--older symptoms? The yellowing tips on mostly upper growth looks a lot like Zn defc., and very likely just a plain lack-of type defc., however, nute burn can present in a similar manner... Zn is locked out only under very alkaline conditions, or P toxicity (never seen it),...let's see what your soil pH is, but a micronutrient supplement might be in order,...



.... for the money, the Accurate 8 by Control Wizard is a great choice; it works on the same principle as the other cheapie garden center units that have those skinny probes, but it's built way more robustly and as such, has better accuracy too; it still needs to be used properly and cleaned fresh with that buff-pad to remove tarnish and residues,... I've heard folks over the Pond say that the A8 isn't available, but found something exactly the same, just a different brand name-? Beyond this, it's more expensive, sophisticated high accuracy devices that a little research will turn up,... Lew, what did you find for your probe? And what reading did it show on the problem plant?...