A water sampler as the name suggests is basically a device that is used for collecting samples of water that will be tested and used for future reference. It is generally used for collecting one or more water samples from the field. First, the water from the field is being collected in a water sampler. Then this collected water is used for testing and results are derived from the same. One can choose from a variety of options available in the market to select a water sampler for use. A grab sample is collected on a water sampler that is mainly designed for collecting water manually. Whereas a composite water sampler is designed in such a way that it can easily collect multiple samples over a particular time period. The selection of a water sampler depends on a number of factors. From the various numbers of factors few of them are listed below:-

• The type of analysis one needs to perform.
• The quality of water that is taken for analysis, whether it is clean water or dirty water, etc.
• The type of water source, whether it is a lake or a pond, a small stream or a large river, coastal waters or a deep ocean.
• The type of environment when the water is being collected in a water sampler, whether the water is being collected during rainy seasons, or any such kind of environmental condition. 
• The location where an analysis needs to be performed, whether it is a hilly area, low lying area, or any such type of area.
• Any other factor.

A water sampler is generally used in addition to a CTD. CTD refers to the Conductivity, Temperature, and Depth. This is considered the most important tool that is used for determining all the essential physical properties that seawater must have in it. In the water sampler, one or more actual samples of water is being collected that is then sent into the lab for analysis after the package gets recovered. The water samples can be used for a varied number of reasons. It can be used in verifying the accuracy of the collected data that is being measured by the instruments that are on the package. It also provides us with additional information that cannot be measured with an instrument that is used in the field for collecting water samples with the use of the water sampler.

The Dugout areas and the small ponds in the particular area are naturally more exposed to water being constant and layers of deposits than any larger water bodies. Stagnation and stratification is common problem in these areas as the water gets stored in the enclosed boundaries. Also as the water is surrounded by boundaries, the water cannot move freely. The water barely gets cleaned as there is no passage available from where dust particles, organic plant waste, or any such waste matter gets cleaned, so it starts depositing in the water bed of the water body and results in stratification.

To know about the Turbidity meter check here.