Bluelab EC/ppm Pen
The Bluelab ppm Pen simply tells you that your plants have the right amount of nutrient in your solution and lets you know if adjustments are needed. Measuring the conductivity every day is the best way to avoid over-diluting or over-concentrating your nutrient solution.
The Bluelab ppm Pen also measures the temperature of the solution, as root health is vital to the success of a crop. To make sure the plants can get at the food, you need to measure the pH of the solution.
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