Soil Mositure Sensor
 The WATERMARK Soil Moisture Sensor by the Irrometer Company is an indirect method of measuring soil water content. It is an electrical resistance type sensor. The iNetGrow System uses the Soil Moisture Sensor with our SM-E Module to measure relative moisture of the soil. Using a scale of 0-10, 0 being completely dry, you can monitor, log and water according to the needs of your plants.