Surber samplers are used for taking quantitative samples of organisms that live in the sediment or gravel of stream beds where the water flow is less than 10cm/s. The NHBS range offers a variety of configuration options, with the original large aluminium frames with a 0.1m2 sampling area, and medium and smaller frames, adaptions such as handles, perspex side panels and a quadrat extension, and net bags with a range of mesh sizes and closed or open ends with filters.