This is a heavy-duty, highly accurate device for controlling humidity in the growing environment. Because this unit keys off of relative humidity (rH), the HC2000 requires a more intensive initial setup than the HC201; the unit must be initially calibrated to precise ambient humidity using a highly accurate tool such as our SP7011 Sling Psychrometer. Once calibrated, the HC2000 provides control over rH with an incredible accuracy of ±1%, in optimal operating range of 20 - 95% rH. Unlike the HC201 which must be situated in an air duct for maximum accuracy, the HC2000 can be placed nearly anywhere in the grow room. Encased in a durable metal housing, these units have been known to operate for over 20 years in extreme conditions without failing! Comes ready to wire with built-in wall-mountable junction box. Rated at 10 amps.