The Soilmoisture Equipment Gypsum block can be used for irrigation scheduling based on soil water potential. Intended for use under tree or vine canopy and root zones, the gypsum block is designed to be buried in the ground for long term irrigation management based on root zone water content. GB6 (Old part number: 5201F1L06): Soilmoisture Gypsum-Block, 6 Ft Lead, Soilmoisture gypsum-block, 6 ft. Lead