How much nutrient needs to be in ro water before ph meter is accurate?

warble said:
Some?
I thought this was a test. I dint study.
Click to expand...
Yea, apparently, neither did i. Iol

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?
 
The pH meter is either accurate or not. The sample being measured does not influence the performance.

Measuring ro is just meaningless because if has no impact on soil pH.
 
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.
 
Lou66 said:
The pH meter is either accurate or not. The sample being measured does not influence the performance.

Measuring ro is just meaningless because if has no impact on soil pH.
Click to expand...
At 0.0, there's no ph buffer, so ph is unstable, and meter readings would be inaccurate, no?
 
warble said:
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.
Click to expand...
Yea, so at low ec levels, strips may be a better option?
 
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