1. Structure: This instrument primarily consists of fiber optics, fiber rack components, light intensity controls, potentiometer buttons, fiber rack legs, light source switches, sockets, light source wiring, white screens, and white screen racks. 2. Light Guide: The fiber optic is formed by connecting the diode holder, condenser lens tube, and objective lens tube via sleeves. The diode holder can rotate and extend within the condenser lens tube, while the condenser lens tube can expand and contract inside the lens barrel to adjust the size and clarity of the beam spot projected onto the white screen. 3. Instrument Installation: Attach the support legs to the light guide rack or white screen. Insert the light guide into the round hole of the light guide holder to rotate the ball. Position the white screen approximately 140 mm away from the beam exit end of the light guide. 4. Adjusting the Emitted Light Beam: Turn on the power to illuminate the light diode. Adjust the positions of the diode holder and condenser lens tube until the edge of the light spot projected onto the white screen becomes clear. Each of the three light guides should be set individually.