The 'Classic Series' Saturn 3 temperature, humidity & CO2 controller offers the indoor gardener the complete solution for their grow area. The CO2 enrichment mode will maintain the garden at your pre-set level to improve your plants performance and help save you money by not overshooting your set point. The day and night variable temperature & humidity ranges are wide enough to accomodate any gardens needs. It also has optional output boxes that can control a heater or a 'high temp' shut-off function for your lights. Your garden is under control with the Saturn 3 from Titan Controls!