Counting pool surface area 20*50mm divided into 1000 small squares with clear lines and reusable. Slide size 25*75mm; Counting area 20*50mm; Clear lines, reusable. Suitable for small plankton; planktonic animals; rotifers; small plankton diatoms (50um-1mm) Convenient operation: The design is ergonomic, easy to clean and store, and improves experimental efficiency. Plankton counting chamber for the identification and enumeration of planktonic algae and small planktonic animals in water samples under the optical microscope