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TR75: Calibrated Delta - T (75 cm)
The calibrated change in temperature of the soil over time after a heat pulse is introduced. From these measurements, soil water potential, fractional water index and volumetric water can be derived. Beginning in 2004, soil moisture sensors at 75 cm are being decomissioned when they fail.

For more information, download the soil moisture README file.
Type Sensor Used Standard Units
Standard - Secondary Campbell Scientific 229 - L degrees Celsius