A tensiometer is a scientific instrument used to measure the tension or pressure of liquids, particularly in soil and plant studies. It helps determine how much water is available to plants by measuring the moisture content in the soil. This information is crucial for agriculture and horticulture, as it aids in efficient irrigation management. In addition to soil studies, tensiometers can also be used in various industrial applications, such as monitoring the tension in cables or measuring the surface tension of liquids. By providing accurate readings, tensiometers help improve processes in fields like agriculture, environmental science, and engineering.