ADVANCE RESEARCH MICROSCOPE MODEL BMC-550 from Micron Instrument Industries. Infinity Plan Achromatic Optical System: Infinity-corrected objectives provide exceptional image flatness, contrast, and resolution with accessory compatibility. Siedentopf Type Binocular Head: 30-degree inclined, 360-degree rotatable head with independent interpupillary adjustment while maintaining focus. Upgradable to Fluorescence, Metallurgical, Polarizing: Versatile platform expands to specialized applications with optional accessories. Reversed Inward Quadruple Ball Bearing Nosepiece: Objectives face inward for protection with easy access and smooth rotation. WF 10x/22mm Wide Field Eyepieces: Wide 20mm field of view provides expanded observation area. Co-Axial Focusing with 0.002mm Graduation: Precise coarse and fine focus adjustment for critical research applications. Ball Bearing Driven Mechanical Stage: Smooth X-Y movement for systematic specimen examination.