Electricity ALLUMINIUM Co-axial Binocular Microscope for Science Lab

Refers to the coaxial focusing mechanism, where coarse and fine focus knobs are mounted on the same axis. This allows users to make both large (coarse) and fine adjustments using the same control, improving ease of use and precision.

Also often implies coaxial illumination, where light travels along the same axis as the observation path, reducing shadows and improving contrast.