Ok Dorje, what are the signs for overwatering, and what are his indicators of ph issues? And what's the difference in appearance between the two?

Soil meters are 100% unreliable crap. Unless you are either replenishing used soil and looking for a ballpark figure, or if you are mixing your own. Most quality potting mixes are pre-buffered, so will show no changes till buffers fade. You'll want to keep your water from fighting the buffers, and only knowing soil ph won't help there.
Rusty Trichome Reviewed by Rusty Trichome on . Yellow leaves, spots - First grow - White Russian - CFL I did some googling prior to this, but honestly I can't nail it down. I beleive the issue started after last feeding (4 days ago). This White Russian is a clone I gotten a month prior. Its transplanted into soil 16 days ago. While it went well it took a few days for yellowing to disappear. About 3 days ago it showed up again. At first it started in middle (I think) and only effected the lower and middle leaves. One is yellow, probably canary yellow, and some dark almost red spoting on edges Rating: 5