A salinity sensor, often referred to as a sal sensor, is a device used to measure the salinity, or the concentration of salts, in water. Salinity is an essential parameter for monitoring water quality, especially in marine environments and certain freshwater systems. Sal sensors help assess the health and suitability of water for various applications, including aquaculture and environmental monitoring.

Sal sensors work by measuring the electrical conductivity of water, which is directly related to the concentration of dissolved salts. Some sensors may also use optical or other methods to measure salinity. These sensors provide real-time data on salinity levels, allowing for efficient monitoring and management of water bodies.

Salinity sensors play a crucial role in maintaining the balance of aquatic ecosystems. They are used to monitor changes in salinity levels due to natural processes or human activities, which can impact marine life and water quality.