JohnDoeTho
Well-Known Member
I got a yellow one off Amazon it works great. I've been using it a couple months and I heard they needed recalibration so I poured some out and it was still spot on.is it the older growth that's yellowing? sometimes it's the ones that've been exposed longer... anyways i'm still learning too but if u can always drop it down if u see too much stretch. i'd also recommend a liquid ph test kit if you don't have one.. i was using a cheap yellow ph meter off amazon for awhile and when i double checked against a liquid kit it was way off despite just being calibrated so idk