Bluelab Pen EC\n\nProduct Overview\n\nProduct description The Bluelab Conductivity Pen simply tells you that your\nplants have the right amount of nutrient in your solution and lets you know if\nadjustments are needed. To feed plants well, we need to know what we're\nfeeding them. Start with a quality nutrient. Measuring the conductivity every\nday is the best way to avoid over-diluting or over-concentrating your nutrient\nsolution. Completely change the reservoir solution every 7 days. Top up the\nnutrient level between changes - so your plants always have the right amount\nof food. The Bluelab Conductivity Pen also measures the temperature of the\nsolution, as root health is vital to the success of a crop. Temperature\naffects the growth rate and structure of a plant so a solution temperature of\n18 - 22?C or 65 - 72?F is recommended. To make sure the plants can get at the\nfood, you need to measure the pH of the solution. Check out our handy Bluelab\npH Pen so you have every tool 4