These cells are commonly used for counting zooplankton. Each cell consists of a rectangular frame mounted on a slide and includes one cover slip. Cell size is 50 mm x 20 mm x 1 mm and volume is 1.0 mL.

    Cells are available in glass or plastic and contain a grid subdivided into microliters, allowing the user to count more accurately. Also available is a glass counting cell without a grid that includes two cover slips.