This TrolMaster CO2 Sensor is a perfect addition to your Hydro-X Environmental Control System. It is designed to measure carbon dioxide levels in both indoor and outdoor settings, making it ideal for hydroponic systems. The sensor is compact, measuring 6 inches in height, length, and width, making it easy to install and use.With 7 different sites available for measurement, this sensor provides accurate and reliable data. The item is brand new and comes with all the necessary components for installation. Add this CO2 Sensor to your Hydro-X Environmental Control System to create a more efficient and effective hydroponic system today.