Normally used as a sample device for crabs, small shrimp, lobster and other small invertebrates. Habitat collectors are suspended in a tank, pond or in the ocean. Over time invertebrates utilize the layers of the habitat as a place to hide. To collect the sample, the habitat is quickly pulled and the contents are dumped into a bucket of water. Long lasting device. Aluminum and plastic componets. Great for education and sampiling. Habitat area dimensions ar 12″ diameter by 9″ high.