Soil Water Potential Lab Instrument

Model: WP4C01272. The WP4C measures water potential by determining the relative humidity of the air above a sample in a sealed chamber (according to ASTM 6836). Once the sample comes into equilibrium with the vapour, the relative humidity is determined using the chilled mirror method. This involves chilling a small mirror until dew begins to form. At the dew point, the WP4C measures the temperature of the mirror and sample to within 0.001 °C. This allows for unrivalled accuracy in the range of -0.1 MPa to -300 MPa so you can have complete confidence in your sample readings.