The Watermark Soil Moisture Sensor measures soil moisture from 0 (saturated) to 200 (dry) centibars This sensor can be connected to a 3000, 2000 or 1000 Series WatchDog Weather Station or any of our WatchDog Pups.. It can also be read with a FieldScout Soil Sensor Reader (Item #6466) but requires an adapter (Item #6450FSADPT) (includes a 25' (7.6m) Cable)