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This stainless steel dredge is designed for grabbing samples from sand, silt or mud substrates in rivers, ponds, or lakes. A simple latch holds the sampler open while lowering. When the line is yanked, the scissor-shaped dredge closes, retrieving sediment for chemical, physical, or biological analysis at the surface. A useful way to sample benthic organisms. This LaMotte dredge is constructed to last under rigorous field conditions.