Know When to Turn it On: Most irrigation systems rely exclusively on soil moisture sensors. Soil moisture sensors can't tell you how much of the water that's present is actually available to plants. This system uses an MPS-1 matric potential sensor to measure plant available water so you know when to turn the water ON. Know When to Turn it Off: Fast-response soil moisture sensors let you track plant water use in real time and set an accurate full point that minimizes wasted water. You know when you've reached field capacity and should turn the water OFF. Monitor Pipe Function: A pressure switch tracks irrigation events by recording when water is turned on and off. You'll know for sure if irrigation is happening as scheduled.