DieselDuds
- 535
- 93
Lol my hydro store guy took 6 top ph pens to test accuracy and all of them were off even after calibrating. I went back to the cheap liquid ph tester after that.Let's start with this..
I have a bluelab ph pen and a Oakton eco ph pen I was gifted from a buddy. I calibrate my blue with the 7.01 fluid and it calibrates. I also turned the pH pen (upside down ) to see if the probe was dirty which it wasn't . Buy there was an air bubble within the probe and it arose to the tip of the probe. Could this cause a problem. The reason I say this is. I calibrated the Oakton with the 7.01 and I'm getting a .03 difference on the ph when testing the resivor water.
Is my blue right. Is the Oakton right?
^^^^ True wisdomLol my hydro store guy took 6 top ph pens to test accuracy and all of them were off even after calibrating. I went back to the cheap liquid ph tester after that.
Or a 7&4...and the way pH is measured, that's about as accurate as you're going to get.
It is measuring the potential hydrogen in a solution... Not accurate at all, yet as accurate as it gets.
It is measuring the potential hydrogen in a solution... Not accurate at all, yet as accurate as it gets.
This is incorrect. Precise measurement of pH is part of International Standard ISO 31-8: https://en.wikipedia.org/wiki/ISO_31-8 and it is very accurate.
There are many pH meters that have an accuracy of +/- 0.01 pH or around there. The thing is, they are laboratory grade instead of consumer grade. So, paying $40 for a pH meter won't be that accurate. Paying $200-700 will.
Companies like Cole Palmer, Edmund Scientific, Oakton, Hach, YSI, for example, each produce portable or benchtop pH meters with an accuracy of +/- 0.01 of the real pH of the solution. They also include automatic temperature compensation, something cheap meters, usually <$100, do not include.
Nope... and you have Illustrated one reason why with regards to temperature affecting measurements.
The other thing, is that pH is always in flux, and the meter only measures the potential of the solution.
It's not the instrument that is doing the measuring, it is the measurement itself.
The iso standard is a red herring... Has nothing to do with the point.
Then what point are you making? Because you have not been clear at all.
Ok ok ok. So what I have gathered from this is ph is always in a state of Flux, agreed on that. I always let my solutions mix well before I give it an ok and try to get the best reading possible.
The point I am trying to make is that small differences in pH readings between the same brand of pens, are insignificant.
Think I have 100 marbles of those you lost 2 is not that big of a difference but you need to keep both standing in water when not in use if the probe dries clear dry will respond strange for a coupla hours (some of the companys reccomand 24 hrs before you use it), also get some drops and learn with your meter how to read the colors. Someone here recommended me that here and then one day mine quit was glad I did. Also Calibrate often till your get used to it. Only now and then do I use it the drops are better.
Ph/ppm/EC is very important how ever all changes in a plant happen over time for a while till your used to the electronic way
test everything you can in and out water before nutrients and after get the feel of it. Hell take a leek and test it.
Read some here about it. Rapid changes in ph will doom your grows. Remember to wait after adjustments before rechecking and shaking is not enough let it stand a bit.
If you like chemistry then you using both up and down at the same time is NOT A REAL GOOD IDEA.
Went the water goes in and comes out with a higher PH/ppm/EC your started down a slope that leads to root problems.
It means there are nutrients building up and not being use.
In time you will flush and if you do you free up all those locked nutrients.
Oh and last thing if is not one of the best PH meters it will be from china.
I have had 3 none lasted and were for a quick check but I mix with drops
Good input, especially when over adjusting with acid, then correcting with base.
Do you have any experience with pH and temps? I'm thinking higher temps will mean higher pH, but I haven't tested it. This grow I am doing a much better job of maintaining cool rez temps and the plants look great
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?