Product Code: 21 Usage: Teaching, surgery, implantation, etc. The microscope has a working distance of 20-25cm and can be adjusted with an electric foot pedal. There are 5 zoom modes to choose from: A (3. X), B (4.9X), C (8.3X), D (13.9X), E (20.4X). The fiber optic lamp can be adjusted to high, medium, or low