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Extreme EC readings with new EC pen

Posted by shadoh6 (My Page) on
Fri, Jan 29, 10 at 7:37

I received my EC pen today, and after checking my solution, the pen read 10.00 ms/cm. I then tested my water and found it to be somewhere between .60 to .70. Can anybody explain why my nutrient solution is reading this way? I'm using GH Maxigrow and I am mixing a lot less than what they recommend. I've been using this strength for about a week now, and my plans appear to be doing better than when I had it at half this strength. Is this a water problem? A EC pen calibration problem (factory calibrated)? Help!

Follow-Up Postings:

RE: Extreme EC readings with new EC pen

The pen seems out of calibration.
Do you need to calibrate this pen yourself? Do you have a calibration solution?
Otherwise, take it back and ask them to calibrate the pen.

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