justsmoking
Active Member
I have the ebb n grow 12 pot system and am using the constant ppm meter by nutradrip. I am also using tap water and when I put the prob in the tank it reads 1300-1465. Then under that it says calibration and there's this screw next to that then bellow that there's range 0-9990ppm below that there's multiply display by 10. ? Can anyone help me with this just this first time?