Water potential describes the force that drives water movement. It is the most fundamental and essential measurement in soil physics.
Unfortunately, it's also a tricky thing to measure. The chart on the right (click on it to view the full image) shows range and accuracy for available instruments and sensors. Find more information about each sensor's advantages and limitations on the individual product pages. For more information on water potential theory, see the resources list on the right.
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Maintenance-Free Water Potential and Temperature Sensor The MPS-2 measures a wide range of soil water potentials (-10 to -500 kPa (pF 2.01 to pF 3.71)) without user maintenance and factory calibration. Install Sensor, Log Data Unlike tensiometers, which need a skilled operator, this dielectric … » Learn more
These modernized tensiometers, built by German company UMS, are THE most accurate way to measure soil matric potential. Thanks to precision engineering, meticulous construction, and fanatical attention to detail, they have terrific accuracy and a range that (with a skilled operator) can extend beyond -200 kPa. » Learn more