The counting chambers are made of a standard microscopic slide and a cover slip. The chamber is made of a standard microscopic slide (L x W x H; 75.0 (±0.2) x 25.0 (±0.2) x 1.0 (±0.1) mm) and a cover glass (32.0 (±0.2) x 24.0 (±0.2) x 0.7 (±0.1) mm). As a result of our strong focus on quality, we managed to set a high standard on the consistency of the actual chamber height and the absence of toxicity. The actual chamber height and the non-toxicity of the slides are depicted in the quality sheet of a specific batch. Moreover our packaging limits the damage of moisture, and increase the shelf life of our counting chambers.