High Quality Professional Trinocular Polarizing Microscope! Great for Geology, Petrology, Mineralogy, Toxicology, Pharmaceutics, and Forensic Medicine! Compare to Similar Units costing $6000+ with name brands! Excellent Bright and Clear Images through High Quality Optics. Built-In Bertrand Lens with Capability for Removal from Optical Path. Built-In Analyzer with Capability for Removal from Optical Path. Rotatable 90 Degrees with Graduation Marks every 1 Degree for the full 90 degrees. Transmitted Light Polarizer, with Capability for Removal from Optical Path. Fully Rotatable 360 Degrees with Graduation Marks every 5 Degrees for the full 360 degrees. Selectable between Brightfield and Polarizing Light. Easily switch between Plane Polarized and Cross Polarized Illumination Four Magnifications: 40x, 100x, 200x, and 400x. Wide Field 10x Eyepiece Set. Four Semi-Plan DIN Strain-Free Objectives: 4x, 10x, 20x, 40x. These Semi-Plan objectives are better quality and more expensive than the cheaper achromatic on most scopes. Spring Loaded 20x and 40x Objectives for Protection. 45 Degree Inclined Trinocular Head, Rotatable 360 Degrees. Adjusts to the Distance Between your Eyes: 55 to 75mm InterPupillary Distance. Diopter Adjustment on Both Oculars to Correct for Your Specific Vision Needs. 1.25 N.A. Abbe Substage Condenser, Condenser Movement Knob, Iris Diaphragm and Swing-Out Filter Holder. Condenser Alignment Screws. Rack and Pinion Steel Gears for Easy and Better Condenser Movement. Blue Filter Included. Fine and Coarse Focusing Knobs on Both Sides of Microscope. Maximum Distance From Bottom of Longest Objective to Top of Stage: 20mm. Fine Adjustment Division: 0.002mm. Rack and Pinion Steel Gears for Focus Movement. Adjustable Screw-Stop to Limit Coarse Range to Protect Specimens. Mica (One Quarter Wavelength) Retarding Compensator Plate. Gypsum (One Full Wavelength) Retarding Compensator Plate. Includes: Extra 10x Eyepiece with Built-in Measuring Reticle: X-Scale, 10mm in 100 divisions, 0.1mm Resolution. Includes: Extra 5x Eyepiece with Built-in Crosshair Reticle. Comes with Instruction Manual, Dust Cover and Lens Cleaning Cloth.