General hydro ph kit

If your referring to the drops that change color, they work, but are only as accurate as your color vision. Depending on the nutrient line to be used, and the style of grow, can do just fine. But if you want to push the girls hard, you'll need to be more accurate.
 
Totally useless! Get a quality PH pen. Cheap ones can cost you your grow........ been there done that..........
 
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