i. Quadrant
ii. Sweep Net
iii. Pooter
iv. Depth Guage
i. Quadrant: for sampling/determining population size frequency and density of a species.
ii. Sweep Net: for catching/collecting insects
iii. Pooter: for sucking in tiny/minute insects and other animals from tree barks, leaf and rock surfaces.
iv. Depth Guage: for measuring depth of water in an aquatic habitat.