* Tool: A microscope is a tool because it is a specific device used to perform a particular task: magnifying tiny objects.

* Equipment: A microscope is also equipment because it is a more complex and larger piece of apparatus used in a laboratory or other setting.

The distinction between tool and equipment is often a matter of scale and complexity. A hammer is a tool, while a construction crane is equipment.

Ultimately, the word you choose to use depends on the context and your intended meaning.