AQUA TEL TDR Soil Moisture Sensor

The AQUA TEL-TDR Soil Moisture Sensor monitors all types of soil at all moisture levels. The TDR also offers an optional soil temperature built into the sensor. The sensor output signal may be used to directly control irrigation. The TDR reads the percent of available moisture by volume using Time Domain Reflectometry Technology. For absolute moisture content it must be califbrated for the specific soil.

Resources

Aqua TDR+T Sensor Datasheet    View
AQUA TEL-TDR Soil Moisture Sensor Manual    View