The 0685 Series are generally used for the quick determination of soil moisture retention values. These handy units provide a large interior extraction surface to soils or sensors incorporated in a porous matrix material used in calibration or retention work. Moisture retention curve is much easier and accurate quicker with a cup assembly that can be removed and weighed without disturbing the sample. Having the large interior ceramic surface areas assure reaching equilibrium in the fastest time possible. Of course, these cup extractor units are very adaptable and can be used in the extractor for pressure extractions of pastes and thick solutions or outside the extractor for stand alone, weighable, or with a vacuum applied provide suction environments for seedlings and other small plants.