I sent you a pm, but for those hew don't know here we go.....
OK PPM stands for Parts Per Million. A PPM meter measures your Parts per Million of nutrients inside your water "So you don't give your plants nut burn". Its a must if you are doing hydro, and a plus for soil. When you look at the directions on your nutrients it will tell you what PPM or EC it sagest you use at full strength. So after your done mixing your rez for your hydro "if thats what you do" you check the PPM and if its around what the directions say it should not burn your plants. If its a lil over you just add water till its at that mark. If its under you just add nuts till it hits the mark... PPM meters are a little pricey. If your going to get one try and get a nutrawand or a blue lab nutrawand. These are both very easy to use and are built well. They also double as a mix wand. I hope this helped you, i am sorry bout writing a book. Just bored at work wanting to give you all the info you were looking for.. Let me know if you have any moor questions...
