1. Focusing: Place the workbench into the mounting hole on the base. When observing transparent specimens, use a ground glass table; When observing opaque specimens, use a black and white table. Then loosen the fastening screws on the focusing slide and adjust the height of the mirror body to a working distance that is roughly the same as the magnification of the selected objective lens. After adjustment, the fastening screws must be locked tightly. When focusing, it is recommended to choose a flat object, such as a flat paper with characters printed on it, a ruler, a triangle, etc. Visual adjustment: First, adjust the visual circles on both the left and right eyepieces to the 0 mark position. Usually, observe from the right eye tube first.

2. Pupil distance adjustment: By flipping the binocular lenses, the distance between the exit pupils of the binocular lenses can be changed.