The original classic device is the perfect size to hold a small volume of sample - about 6 ml. The shape and configuration of the shallow, etched groove (1/8" deep and 3/16" thick) help locate specific areas on the chamber.
With guidance from John Gannon of the Great Lakes Lab in Windsor, Ontario, Wildlife Supply (TM) has developed the definitive low-cost apparatus for enumerating zooplankton micro-crustacea. The modified device is the perfect size to hold a large volume of sample - about 39 ml, in fact. The shape and configuration of the shallow, also etched groove (1/2" deep and 3/8" thick) help locate specific areas on the chamber.
A compact 3-1/2" by 4-1/2" in size, it slips easily under a dissecting microscope. Straight sides mean you don't have to focus up and down. Rounded edges prevent specimens from catching.