A conductivity sensor is a device used to measure the electrical conductivity of a solution, which indicates the concentration of ions present. It works by passing an electrical current through the solution and measuring how easily the current flows. Higher conductivity usually means a higher concentration of dissolved salts or minerals, making these sensors useful in various applications, including water quality testing and industrial processes. These sensors are commonly used in fields such as environmental monitoring, agriculture, and aquaculture. They help assess the health of water bodies and ensure optimal conditions for plants and aquatic life. Conductivity sensors can be found in handheld devices or integrated into larger systems for continuous monitoring.