im glad you said that because thats actually what happens; the deeper you go into your soil beds the more acidic it becomes..generally i think its the top 4-7" of soil will read much higher than the bottom levels. Your right the media staying moist at lower depths is one reason that creates that.. with chemicals its where the metals, salts & acids (H+ ions) basically get flushed to and build up in mass amounts, and unless constantly flushed they will always continue to build up..clearly much more than the tops. Which dry basically daily/bi-daily as popped to some bottoms that never dry. Im always lost on why they tell people to water when they can stick a finger i and feel the top inch or two is dry.. I always tell people pick the pot up if you feel weight to it .. WAIT .. and don't water.. until you can feel the pot is light and needs water. Theres a point of TOO DRY clearly too but too wet is way worse for your grows.
and again yes a general good flush will reset it... all our soils have adjusters like lime or something that aid in reverting the natural soil ph back to specific level when the media drys back out.
and again yes a general good flush will reset it... all our soils have adjusters like lime or something that aid in reverting the natural soil ph back to specific level when the media drys back out.
-shoving a liquid only type digital pH meter into soil is NOT something I'd do, though a few noobs have done this from what I've seen at the Infirmary-
... (I like that BL soil pH meter though, going to look it up and see how $$ it is!) ....The beauty of a long probe is that you can test in-pot, at any point duringthe grow, any depth, when a slurry test is impossible,... Again, our water is 200ppm /7.6 pH right now, fairly hard... I'm thinking yours is softer (what's the EC/ppm of yours?), hence the acid quantity difference, though it is a big one! But I know what I put in, and what it did to pH... A little sure does go a long way! ... Also, my HM digital pH meter is freshly calibrated, and like I said, I've tested it against the liquid drops pH test kit,-- if you have normal color vision, there's little to mistake about the readings, which I know are not very exact, but are within a couple tenths at worst,... As mentioned, I tested soil moistened with pH'ed and unpH'ed water, before planting, and the pH readings on two were plenty clear, only caveat is that they weren't let be for a day to allow the buffers to fully react,... but a drop of that magnitude from the reg. water vs pH'ed 6.6 even initially was great enough that I didn't feel comfortable using the adjusted water for moistening that day,... and the readings the next day, confirmed this further,... I'll test agin today,... I was puzzled by the KS readings as well, and I don't totally eliminate the possibility that the A8 probe is reading wrong, for whatever reason-? But I can't imagine how or why, having used it to good effect for 2 years now,.. I burned a couple Foxfarms soil rep's before, by testing their shit soil right there in the store, in-bag even--- low 5's! 
Tested other brands too, just to show, it's not the probe,...
..in my head, I think of the A8 as a probe, not a meter,... Roger that on the A8 not being designed for certain types of soil,... I just wonder why, technically speaking... Can you tell us exactly how you test the soil layers later on, when the slurry test isn't anoption anymore?
Thanks KS!
