Agrowtek's GC-ProXL-E controls up to three climate zones and two nutrient reservoirs. Same great features as GC-Pro, with expanded hardware to handle more sensors and relays. Includes four sensor ports, eight discrete inputs, sixteen 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. Shown with optional touchscreen display.