| http://www.w3.org/ns/prov#value | - --- A pH Control Kit contains a pH test kit to measure the pH of liquids like water or hydroponic nutrient solution, pH-up to raise the pH, and pH-down to lower the pH. --- A pH Test Kit is used to measure the pH of liquids like water or hydroponic nutrient solution. --- A pH Meter is used to measure the pH of water and other liquids, hydroponic nutrient solution, hydroponic media, and soil. --- A
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