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The WP4C should be regularly checked against known water activity standards. This specific-molality salt solution in single-use disposable vials make verification quick and easy (50 vials).
The WP4C measures water potential by determining the relative humidity of the air above a sample in a sealed chamber (conforms to ASTM 6836).
If you want to know something about your soil—how it behaves, how much clay there is, or if there are crystalline structures that may expand when water is present, the VAPOR SORPTION ANALYZER is your simplest and most accurate option.