I actually do have a ppm meter. I’ve just never thought I needed it since my ph was always good and it would state the ppms per ml of the CalMag and the nutes I used to I never bothered to check ppms but now I’m going to start checking that also so make sure I’m not over feeding her anything. I’ve just never worried since I thought my water was always 0ppms since it was store bought distilled and I still would let it sit for 24 hours with the cap off the evaporate anything that might of been in that bottle water I bought. I usually just check the ph of my soil and the ph of the water that runs out the bottle of the pot when I water or feed them.