This post explains how to make a wet mount. Video included!
The hemocytometer (or haemocytometer or counting chamber) is a specimen slide which is used to determine the concentration of cells in a liquid sample. It is frequently used to determine the concentration of blood cells (hence the name “hemo-“) but also the concentration of sperm cells in a sample.
The thickness of the cover glass can have a significant impact on the resolution.
A wet mount (or temporary mount) is one of the most common ways of observing specimens under the microscope.