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TrolMaster - Hydro-X Pro Controller with 4-in-1 Sensor (Temp / Humid / CO2/ Light ) and Cable set, Free Phone App NEW spl_cp Heavy duty plastic stakes usedTrolMaster revolutionized environmental controller technology when it introduced the Hydro X. The Hydro X Pro continues the revolution with a 10 touch screen and a web based software. The Hydro X Pro is backwards compatible with all current Hydro X control device modules. It also provides greater flexibility and allows any plug in module to be addressed to be whatever the user wants. The user can also set up each plug in module to have multiple