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A Kemmerer Sampler is a device that is usually used to obtain a
water sample from a specific depth in lakes or streams. It is less
frequently used to sample monitoring wells. First, the supporting
cable is marked to identify the depth at which the sample will be
taken. As it is lowered, the water passes freely through the body
of the sampler. At the designated depth, a weighted messenger is
dropped down the cable. When it reaches the sampler, the messenger
activates a trip mechanism that closes a plug/stopper at the bottom
and top of the sampler thus sealing the water inside.