METER TEROS 21 Soil Water Potential Sensor

The TEROS 21 is the world’s first full-range water potential sensor with high accuracy, low maintenance, and low cost.


  • Measure from near saturation to air dry (−5 to −100,000 kPa)
  • Tough, long-lasting body
  • Digital SDI-12 communication


TEROS 21 is a maintenance-free matric potential sensor designed for long-term, continuous field measurements. The TEROS 21 measures the dielectric permittivity of a solid matrix to determine the water content of the solid matrix. The relationship between water content and matric potential, known as the soil moisture characteristic curve, is used to calculate the soil matric potential. This measurement approach, along with the calibration process used in production, allows for accurate measurements of water potential.


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40271-P40271-PTEROS 21 soil water potential sensor, 5m cablequick_quote