Titan Controls Eos Complete Humidity Controller (6 Cs) Harvest & Storage Kings Mix also excels at Water Pumps Aeration & Irrigation Kings Mix also excels at encouraging root development for propagation of seeds and starts and is an ideal choice for developing starts into vigorous this waterproof poly film is black on one side and white on the other This controller also features low temperature protection in the event that achieving the desired humidity level results in an undesirable temperature Set your desired humidity level and the controller will activate and deactivate humidifying and dehumidifying equipment appropriately