Product principle use attention first clamp outlet rubber tube, and then two semi-circular cover open. Let the water collector sink into the water,the bottom inlet will automatically open. Can collect different depths of the water samples, above a rope, under the water, above the water. When the water collector stops at different depths, the water sample collected is the water sample of this level. The depth of sinking shall be marked on the tether. When sinking into the required depth, the tether shall be raised and the upper cover and the lower inlet shall be automatically closed. After the water surface is raised, do not touch the bottom to avoid leakage of the water sample. The water outlet rubber tube into the mouth of the container, loosen the clamp, the water sample is injected into the container.