Soil - Moisture

Soil Water Potential Lab Instrument - WP4C

Soil Water Potential Lab Instrument

Accurate and easy-to-use. Measure water potential in minutes.

As world experts in water potential and soil suction, it wasn’t enough to engineer an instrument that delivered consistent accuracy. We also designed it to be easy to use and take only minutes to register measurements, even in dry soils.

  • Precise mode
  • Chilled mirror dew point technique
  • Fast equilibration
  • Unparalleled accuracy in the -0.1 MPa to -300 MPa range
  • Durable and easy to clean
  • Easy to calibrate with saturated salt solutions
  • Conforms to ASTM 6836
  • Use with HYPROP to create a full soil moisture release curve
  • Travel Case
  • Verification Standards (50 Vials)
  • Thermal Equilibration Plate
  • Stainless Steel Sample Cups/Lids


The WP4C is a complex instrument due to its versatility, but extremely easy to use with sample sizes up to 15 ml. Simply fill the cup with soil, leaves or seeds, and then equilibrate the sample. There’s absolutely no change in the measurement for whatever you’re analyzing.


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