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TEROS 21 Water Potential Sensor

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TEROS 21 Water Potential Sensor

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The TEROS 21 is a matrix water potential sensor that provides long term, maintenance-free soil water potential and temperature readings at any depth without sensitivity to salts.

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SKU: 40271-P | Categories: ,


Solid ceramics necessarily have a wide range of pore sizes that can typically measure soil water potential of -100kPa and drier. Solid ceramics have a slower response time than tensiometers and so are more suited to general monitoring of soil suction within or under structures of buildings, roadways and mine sites. The TEROS 21 is a matrix water potential sensor that provides long term, maintenance-free soil water potential and temperature readings at any depth without sensitivity to salts. The range of the TEROS 21 goes from field capacity to air dry. Lab and field tests indicate that it can make accurate measurements at water potentials at least as dry as permanent wilting point.

The TEROS 21 features:

Dramatically Improved Accuracy – Accuracy (+/- 10% of the reading) comes from the TEROS 21’s six point factory calibration. Compare with confidence to other TEROS 21 sensors or to other measures of water potential.
Tough, Long-Lasting Body – Epoxy overmolding will withstand even difficult field conditions. Sensors are rated for long-term research studies.
No Recalibration – Other matrix potential sensors have a tendency to degrade over time. The TEROS 21 uses a silica based ceramic material that doesn’t degrade and doesn’t need replacement or recalibration.
Insensitivity to Salts – The sensor is accurate in salty environments, a variety of soils, and even in locations where the salinity conditions change over time.
Affordability – Breakthrough calibration technique gives the TEROS 21 the accuracy of an individually calibrated sensor at a price comparable to most uncalibrated sensors.
Excellent Range – The TEROS 21 has sensitivity from -9 kPa all the way to air dry (-100,000 kPa), with accurate measurements to at least permanent wilting point.
Onboard Temperature Measurement – Temperature measurements let you evaluate another important growing condition without adding a sensor.
Plug and Play Capability – Just install the sensor, plug it into the Em50 series logger, set the clock and measurement intervals, and start logging data. No programming required.
Remote access to data – Use the TEROS 21 with an Em50G data logger and access your data from your office, lab, classroom, or anywhere with an internet connection.
SDI-12 Compatible – The TEROS 21 is compatible with nearly all major commercial data loggers through SDI-12, a universal communications protocol.
The Meter TEROS 21 was previously the Decagon MPS-6.

The SNiP-MPS is a ‘Sensor Node Integrated Package’ for LoRaWAN or CAT-M1 communication of real-time soil moisture potential and temperature measurements for continuous soil monitoring.

The base SNiP-MPS integrates an S-NODE and 1 TEROS-21 soil moisture sensor (previously the Decagon MPS-6) to a site’s unique network, communication and power requirements. The S-NODE can support an added 3 TEROS-21 devices.

This product is compatible with Datastream.

Additional information



Cable length



Bare Sensors, Integrated Systems

Available for Rent






ICT International has been providing solutions for soil, plant and environmental monitoring since 1982.


In the early 1980’s, Dr Peter Cull, having completed his PhD in irrigation monitoring, sought to expand his research and bring together scientific theories with their practical applications especially in soil and plant sciences. For Peter, water was always the key and he believed that developing precision instruments to accurately measure, monitor and understand water would make a significant difference to some of the major challenges in food production and land use. That was thirty years ago. Since then, Peter and his wife Susan have developed ICT International into a highly successful manufacturing and export company providing scientific measuring and monitoring solutions in some of the world’s harshest and most vulnerable environments. Peter, Susan and their team have built on the immense wealth of scientific knowledge to design, develop and manufacture their quantitative monitoring technologies and work collaboratively with leading soil, plant and environmental scientists in Australia and overseas as part of their world-renowned research and development program.