The Van Dorn water sampler (horizontal water bottle) has been specially designed for the sampling of open water. As a result of the material choice, it is also suitable for sampling coastal waters and for the analysis for heavy metals. The horizontal water flow through is not hindered by constrictions so that no appreciable contamination can occur in shallow water. As a result, the sampler is also suitable for measuring parameters in water with solid particles or constituents bound to them, possibly in large quantities. The Van Dorn water sampler holds 2.2 litre.