I know it's not good for the ph probe, to put into ro water. I'm going to be watering some seedlings soon, with 0.2 ec water. 0.2, imo, isn't much more than 0.0. Is it safe to ph meter 0.2?
I have a cheap Ph meter. I calibrate by comparing to the drops. I also use litmus ribbons if things look strange. I have used my Ph meter in RO water, but that stuff still has an 8-18 ppms.
I have a cheap Ph meter. I calibrate by comparing to the drops. I also use litmus ribbons if things look strange. I have used my Ph meter in RO water, but that stuff still has an 8-18 ppms.