So after three girls being planted, one almost done, I decided it was a good idea to do a slurry test right out of the bag of the roots organics 707 mix since I have a ppm meter now. So if anyone was curious I got a reading of 6.55 for PH and the ppm was 200-300. For my PH I use the cheap checker by Hannah, the red one....but for ppm I got the magical harry potter wand....the blue lab truncheon. Will get a blue lab for PH here soon too. Hope this helps some one in their journeys