Mini-Surber, 500 ? A surber is a net placed on the bottom of shallow streams to sample for benthic invertebrates quantitatively. We're proud to offer a scaled-down version perfect for schools. With stainless steel frame, 500 micron Nitex net and taffeta wings, it stands 6" high, has an 11" long net and a sampling area of 1/4 square foot. Qty :