Introducing The Conductivity EC Pen By Bluelab The Bluelab EC or PPM Pen provides an accurate reading of the nutrient levels in your plant's solution and alerts you when adjustments are necessary. To ensure optimal plant nutrition, it's essential to have a high-quality nutrient and measure the conductivity regularly. To avoid over-diluting or over-concentrating the solution, it's recommended to change the entire reservoir every 7 days and add nutrients as needed. The Bluelab EC or PPM Pen also measures the solution temperature, which is critical for root health and plant growth. The ideal temperature range for a nutrient solution is 18-22°C or 65-72°F. Features Measures conductivity and temperature Selectable units for conductivity and temperature Backlit LCD display Calibration optional Successful EC or ppm calibration indicator Hold reading function Low battery indicator Fully waterproof Auto off function Automatic temperature compensation 1 x AAA alkaline battery included
