The D500 is a specialized version of our B390 biological compound microscope, equipped with five binocular heads for up to five simultaneous users. All heads offer binocular viewing with independent adjustments. In school, up to five lab partners can work together, while in a professional environment, colleagues can consult on pathological examinations among other things. With high quality optics and precision mechanics, this model is an easy choice for medical labs and schools. The binocular heads can be customized for each user, with sliding interpupillary adjusters for varying eye spacing, and diopters for both eyes to fine-tune focus for nearsighted users and for asymmetry. The heads are mounted to a large framework which requires a large working surface. The ocular tubes are set at a 45° incline for viewing while seated or standing. Interchangeable eyepieces allow for an expanded magnification range, or the use of special eyepieces with pointers and measuring reticles. The objective turret provides instant access to 4 magnification levels to easily focus in on minute details from 40X to 1000X. Additional 16X eyepieces expand the maximum magnification to 1600X with 8 unique levels. This covers magnifications needed for studying hair follicles, cells, and bacteria. These high-quality lenses are achromatically corrected to improve resolution and color accuracy. Five Binocular Heads for Five Persons to Observe at Same Time Fully Coated Optical System with High Resolution Showing Sharp Image 45 Degree Inclined, Rotatable Binocular Heads Large Double Layer Mechanical Stage with Slide Clips Coaxial Coarse & Fine Focusing Upward Stage Stopper to Prevent Slide Breakage and Objective Damage Abbe Condenser with Iris Diaphragm & Filter Rack and Pinion Adjustment for Condenser Built-In Halogen Illumination System with Adjustable Brightness Specifications Nosepiece: Quadruple Mechanical Tube Length: 6-5/16" (160mm) Heads: five binocular anti-mould viewing heads inclined at 45 degree Interpupillary Distance: 2-3/16" - 3-0" (55 - 75mm) Eyepieces: WF10X, P16X Achromatic Objectives: 4X, 10X, 40X (spring), 100X (spring, oil) Stage Dimensions: 5-1/2"x 5-1/2" (140x140mm) Stage Traveling Range: 2-3/4"x 1-3/4" (70x45mm) Focusing Range: 1-3/16" (30mm) Division of Fine Focusing: 0.0000787" (0.002mm) Abbe Condenser: NA=1.25 with rack and pinion focusing control Illumination: halogen lamp, 24V/1000W Power Supply: 115VAC 60Hz Packing List:One microscope body Five binocular heads Multi-head mounting assembly with two vertical supports One lamp housing One power supply for lamp housing Four objective lenses: 4X,10X,40X,100X 10 10X eyepieces10 16X eyepieces One power cord (US and Canada standard)