Bottom samplers collect flora and fauna in gravel and cobble stream bottoms. The Hess Sampler consists of a circular cylinder which is pushed into the substrate. Substrate bottom is then stirred up, and the organisms are washed into the collecting bag by the current flowing through the front screen opening. The net and screen wrap around the frame and are secured with Velcro®, enabling them to be easily removed. The sampler is 14" in diameter and 18" high. Weighs 12 lbs. Made in USA.