Check the listing for details. Pro-Leaf CO2 Controller – PPM-B1. Condition: New. Listed at 499.99 USD. The Pro-Leaf CO2 Controller – PPM-B1 is a top-of-the-line fan speed control that ensures optimal air ventilation and extraction for your hydroponic setup. Designed by Pro-Leaf, a trusted brand in the hydroponics industry, this controller is perfect for those who want to maintain the perfect environment for their plants. With its precise control over fan speed, this controller is ideal for those who want to adjust the airflow in their hydroponic setup. It is easy to use and comes with a range of features that make it an excellent choice for any hydroponic enthusiast. Whether you’re a seasoned grower or just starting out, the Pro-Leaf CO2 Controller – PPM-B1 is a must-have for anyone who wants to ensure their plants thrive. New condition please view photos provided if you have any questions please message me prior to purchasing. Please be advised that my shipping quote is for all normal US destinations only ( lower 48 ) all other buyers need to email me for a shipping quote. Be sure to check out my other listings for more great deals! *mike*