Bluelab OnePen™Bluelab OnePen Introducing the Bluelab OnePen, the new all in one solution to measure pH, Conductivity (EC), and Temperature, ensuring you give your plants the nutrient balance they need. While Electrical Conductivity (EC) indicates the total amount of nutrients in your solution, pH (potential Hydrogen) shows how acidic or alkaline your solution is, which determines nutrient absorption. Temperature affects your plants growth rate and structure. By
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