Ph pen madness

1212ham

Well-Known Member
I just calibrated tmthese 2 pens and then when I measured my tap water they come.out completely different... which one do I trust?
That's a good question! Are they kept in storage solution? Is one or both slow to stabilize? What's the ec of your tap? Low ec solutions have weaker ph and are slower to read. I'd try the same test with your nute solution. They are showing different temperature, but those few degrees would cause far less than .1 deference in ph.

Cleaning can help. You could try soaking in vinegar an hour or so then into storage solution for at least another hour, then check calibration again.
I rejuvenated my probe with hci acid after letting it dry out....

Some info on probe maintenance...
 

1212ham

Well-Known Member
i have an apera ec meter, i like it, they make good stuff
They do, my next meter will be the Apera PH60, they even have a wi-fi version now. I'd like to have another good meter for verification if something doesn't feel right, plus I'd like to have the pen style. I'm quite happy with my Milwaukee MW102, but probes age and can be damaged.
 
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