(BETA-2) Digital Day/Night Fan Speed ControllerOverview TrolMaster's BETA 2 can control variable speed fans by using the current temperature to increase or decrease the fan speed. By increasing the fan speed, cooling is increased. Decreasing fan speed will reduce cooling capacity. Using the BETA 2 in this way provides a VERY economical and efficient way of dealing with heat within an enclosed space. Features LED Display, Easy Operation Fan Speed Control Range 25 100% Built In Photocell Detecting
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