The JZYW-200A from Beijing United Test Co., Ltd., is an interface tensiometer that is suitable for the determination of matric water (soil moisture) potential tension in the vadose zone. It is used in a wide variety of applications in irrigation works, electric power department, as well as for research and education work in petroleum, chemical engineering, and science academy. It is easy to use, and provides precise automatic measurements. The system comes with platinum ring, platinum torsional wire, differential sensor and data processing system.