Agrowtek's GC-Pro controls up to three climate zones and two nutrient reservoirs. Complete control of temperature, humidity, lighting, CO2 (sensor optional), timers, dosing, irrigation and more! Includes two sensor ports, four discrete inputs, twelve outputs for relays and one basic climate sensor. Serial & Ethernet ports for free remote monitoring software. Up to three (3) climate zones, two (2) zones each with hydroponics dosing for up to eight (8) parts plus two (2) pH.