The Cellometer Glass/Plastic Disposable Cell Counting Chamber features an improved Neubauer counting grid on plastic that is mounted onto a standard 25 x 75mm (1x3") glass slide. The dual counting chamber has a sample introduction port, counting grid and air evacuation port and are ideal for laboratories working with infectious samples. Duplicate samples may be counted or control and unknown sample may be counted on the same slide. No coverslip is required for the Cellometer thus avoiding counting errors. The Cellometer All Plastic Disposable Cell Counting Chambers feature the same Neubauer counting grid mounted onto a 20 x 75mm (3/4 x 3") plastic base. The same procedure applies as for the glass/plastic counting chamber.