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yes you did, I have purchased several of those, many are way out right out of the box and cannot be calibrated, i have compared 3 new ones against each other all calibrated and they all read very differently. They cannot be trusted.

I have been fighting root rot over and over again. I am growing in DWC, I am planning on going to a flood and drain system hoping this will be better. I have been using bleach to fight the root rot with great success except due to hi res temps and probably low DO It comes back. I have been...