TrolMaster Beta-6 Legacy Beta Series Digital Controller (Day/Night Humidity 110V) 6-Inch Carbon Filters S/cm solution is the one

S/cm solution is the one best suited for general use

The packet is 6in x 4in

it suits big grow rooms

A minimum of 7

TrolMaster Beta-6 Legacy Beta Series Digital Controller (Day/Night Humidity 110V) 6-Inch Carbon Filters S/cm solution is the oneTrolMaster BETA 6 digital humidity controller The TrolMaster BETA 6 is a plug and play controller for a humidifier or dehumidifier on standard 110 120V. A 16 ft remote probe reads humidity right in the canopy instead of at the wall. It holds a 20 90% RH range with a 5% deadband for steady, accurate control. A built in photocell switches between separate day and night setpoints on its own. Day night control for grow rooms and hydroponic gardens