Jimm :tiphat: ...yeah, those skinny soil probes are all but useless,..I've tried and tested them too! The Accurate 8 should be available out your way...? It works on the same principle, but is far better made,.... Hmmm, your new pH meter should have come with a little packet of calibration solution, in powdered form, just add distilled/RO water,...(using other non-specific solutions like milk/coffee is a bad idea, don't care what the other dudes did,.. water science is something I'm well versed in, and simply put these are not reliable standards for calibration!)... calll the company and ask about this,... 7.0 soln. is what you want,... ***... I did see the odd yellowing on that newer growth, but can't make a call for sure on what that is,... usually, this is an immobile nutrient (meaning the plant can't pull it from other established tissues, typically from lower down, and move it up to support new growth), and so that narrows things down,.. but that symptom I see doesn't quit fit the usual suspects,... I'll look into it further, can't just now,... do you have supplement's with Fe, Mn, Zn, Cu in them? A Ca-Mg supp' too? ... ..check ya later bud,...!
