Soil Tension sensor is a solid state electrical resistance sensing device that is used to measure soil water tension. As the tension changes with water content the resistance changes as well. That resistance can be measured using the soil Sensor. The sensor consists of a pair of highly corrosion resistant electrodes that are embedded within a granular matrix. A current is applied to the Sensor to obtain a resistance value. This sensor is designed to be a permanent sensor, placed in the soil to be monitored and “read” as often as necessary with a portable or stationary device. Internally installed gypsum provides some buffering for the effect of salinity levels normally found in irrigated agricultural crops and landscapes.