The 'Classic Series' Saturn 2 - Temperature, humidity and CO2 integration controller allows complete automation with this simple and straightforward controller. Keep your Fahrenheit (40°F to 100°F) and RH (20% to 80%) at the ideal levels, then add CO2 enrichment using a Titan Controls - Atlas Series (found under CO2 devices tab) CO2 controller, and you've got a perfectly balanced room where your plants will flourish. Happy plants equals higher yields! The Saturn 2 is built with pride in the USA and uses only the finest materials available.