What device is primarily used in laboratories to view tiny cells and organisms?

The microscope is the device primarily used in laboratories to view tiny cells and organisms due to its ability to magnify small specimens. This tool is essential in many scientific disciplines, including biology, microbiology, and medicine, as it allows for detailed examination of structures that are not visible to the naked eye.

Microscopes can provide images with various degrees of magnification and resolution, enabling scientists to study the morphology, behavior, and interactions of cells and microscopic organisms. There are several types of microscopes, including light microscopes and electron microscopes, each serving specific needs in lab settings.

The other devices listed have distinct purposes. A dissector is used for separating or dissecting tissues rather than viewing them. An analyser typically refers to equipment that performs tests or analyzes chemical properties rather than directly magnifying images. A calorimeter measures heat transfer during physical or chemical processes, which is unrelated to visualizing cells and organisms.