The Kemmerer water sampler (vertical water bottle) is used for general water sampling in lakes, channels, wells and the sea.

The sampler is essentially a metal tube with stoppers on each end that can be held open when the sampler is lowered by a line to a desired depth. These same stoppers can then be triggered to close the ends of the tube when a metal cylinder called a messenger is dropped down the line holding the Kemmerer sampler.  The closures are made entirely out of plastic parts so that there is no risk of the sample coming into contact with metal.  The Kemmerer water sampler holds 1.2 litre with a maximum sampling depth of 30 meters