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I have one of the cheap yellow ones from Amazon worked okay through my first grow until I started to use the scrog net then it became a pain to use. I just take a sample every time and use the drops. I incorporated a hose that has the reservoir solution flowing out of it for taking a sample. Also made me a little holder for the vials.
I use only ph paper these days. I’ve used the yellow one for years and more expensive like H&M. They’re all a pain in the ass. Now I just aim for close to 6
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