Place a Watermark Sensor in the root zone of your crop or turf and use the handheld digital meter to get an instant reading of moisture tension from 0 (saturated) to 200 (dry) centibars. Use in conjunction with evapotranspiration (ET Gauge) estimates to fine-tune irrigation scheduling. One digital meter reads all your sensors. Each sensor includes a 5ft(1.5m) extendable cable.