Water samplers are devices used to collect water samples from various sources, such as rivers, lakes, and oceans. They help scientists and researchers analyze water quality by measuring parameters like temperature, pH, and the presence of pollutants. These tools can be simple, like bottles, or more complex, like automated systems that can take samples at different depths. Different types of water samplers are designed for specific purposes. For example, Niskin bottles are often used in oceanography to collect water at various depths, while grab samplers are used for surface water collection. Proper sampling techniques ensure accurate data for environmental monitoring and research.