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Adjustable temperature coefficients (β) from 0.0 to 2.4%? What is this and how dose it affect my ph readings and were should it b at? Thanx

temperature coefficients (β) from 0.0 to 2.4% for greater consistency and reproducibility.?. What should it b at n what dose it do? And also the TDS factor adjustable from 0.45 to 1.00

I have some lavender kush clones in coco 24hr veg. I'm feeding them 1ml roots excellerator 4ml silica blast 5ml calmag+ 8ml liquid karma 10ml pure blend pro. Alot of the older fan leaves r getting brown spots all over and are startin to get a lil yellow. Can u tell me wats wrong n how to fix? Thanx