G.A.S Intelligent Humidity ControllerG. A. S INTELLIGENT HUMIDITY CONTROLLER THE G. A. S INTELLIGENT HUMIDITY CONTROLLER IS FOR USE WITH ANY HUMIDIFIER The Intelligent Humidity Controller monitors your grow room environment and controls the humidity levels to VPD (vapour pressure deficit) or relative humidity. Humidity is a complicated business in grow rooms. Dry air allows water to evaporate, which leads to your plants transpiring or water evaporating from the leaves. In turn, they draw