What do Trellis' soil moisture sensors measure?

What do Trellis' soil moisture sensors measure?

Our sensors measure soil moisture tension, a measure of how difficult it is for the plant to extract water from the soil. 

Soil moisture tension is a negative pressure value, measured in kilopascals (kPa). The lower the number, the harder it is for the plant to get water. 

Sensors also measure temperature! Trellis’ sensors measure soil temperature at a depth of 2” below the surface.
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