welp, ive already got a soil moisture/ph/lite meter for em, had it the first couple attempts at growin, i also have a ph drop meter. i dont really use it too much cuz i can never tell what color it really is, i think ill just mix up just a couple mL of the grow with some ph'd water, maybe that would help. but where is this ppm meter? for 20$?! ill def get that, ive been tryin to find one cheap so i can do the Lucas Formula and see how that works out.