A top mounting detachable mechanical stage is a laboratory instrument used in microscopy to hold and move specimens on a microscope slide. It is similar to a regular detachable mechanical stage but is designed to be mounted on top of the microscope stage rather than being inserted into it.

This allows for greater flexibility in choosing the size and shape of the stage and also makes it easier to remove and replace the stage. The top mounting feature of this stage makes it easy to use in a variety of laboratory settings, including those with custom or non-standard microscope stages.

The mechanical stage typically includes a vernier scale or other measuring device to aid in accurate placement of the specimen. The top mounting detachable mechanical stage is commonly used in research and clinical laboratories for a variety of applications, including histology, pathology, and microbiology.