Water sampling devices are tools used to collect water samples from various sources, such as rivers, lakes, and oceans. These devices help scientists and researchers analyze water quality, monitor pollution levels, and study aquatic ecosystems. Common types include bottle samplers, grab samplers, and automatic samplers, each designed for specific sampling needs. The collected samples can be tested for various parameters, including pH, dissolved oxygen, and the presence of contaminants like heavy metals or bacteria. Accurate water sampling is essential for environmental monitoring, ensuring safe drinking water, and protecting aquatic life.