TrolMaster Digital Day / Night Humidity sensor (BETA-6) features a precision humidity sensor within a 16ft remote probe assembly. Simply plug in your humidity / dehumidify device to the power outlet on the bottom of the BETA-6. The user can select separate “day / night” humidity settings and the photocell built into the BETA-6 will automatically start controlling your device. (Settings from 20-90% rH) Either humidifiers or dehumidifiers can be controlled by the BETA-6.