TECHGROW - HUMI TWIN - HUMIDITY CONTROLLER- (SENSOR NOT INCLUDED)** This product comes without sensor, sold separately ** Available sensors: humidity and temperature sensors (article code 12001) Use the Humi Twin to control your humidifier or dehumidifier. Switch between the two using the handy switch on the back, alternating between humidifying and dehumidifying the air to precisely maintain the ideal humidity level for your room adjustable from 10% to 90% relative humidity. Easy to use, its clear LCD screen