This is a trinocular compound microscope has magnificaitons ranging from 40X to 400X. The compound microscope features an optical system for simultaneously observing images through eyepieces and an adjustable trinocular port. The compound microscopy includes a 45 degree inclined 360 degree swiveling trinocular head, body frame, revolving quadruple nosepiece, a pair of widefield eyepieces WF10X/18, four DIN achromatic objectives: 4X, 10X, 20X, 40X (spring), large double layer mechanical stage, Abbe NA1.25 condenser with iris diaphragm and a 6V/20W halogen illumination system. The trinocular port is easy to mount photo or video capability. All lenses are made of high quality optical glass. The high resolution image in the field of view is crystal clear and will satisfy the demands of professionals. Features: 45 degree inclined 360 degree swiveling trinocular viewing head 6V/20W halogen transmitted light with adjustable intensity 4 achromatic objectives DIN 4X, 10X, 20X, 40X(spring) Large double layer mechanical stage with NA1.25 Abbe condenser & iris diaphragm Coaxial coarse & fine focus knobs with tension control Specifications: Model: M837E Total magnification: 40X-100X-200X-400X Eyepieces: widefield WF10X/18 Objectives: achromatic DIN 4X, 10X, 20X, 40X (S) Viewing head: 45°Inclined 360°swiveling trinocular Interpupillary distance: sliding adjustable 2-3/16" ~ 2-15/16" (55mm ~ 75mm) Diopter: adjustable on both eyepiece tubes Nosepiece: revolving quadruple Stage: mechanical stain-resistant double layer, size: 5-1/2" x 5-1/2" (140mm x 140mm), translation range: 3" x 2" (75mm x 50mm) Photo tube adjustment range: 5/8" (15mm) Focus: coaxial coarse and fine focus knobs on both sides, rack & pinion adjustment, with tension control Focusing knob can be locked for observation & transportation Condenser & diaphragm: Abbe NA1.25 rack & pinion adjustment condenser with iris aperture diaphragm Black palm rest on the base Illumination: transmitted (lower), 6V/20W halogen bulb, variable intensity Metal mechanical components Power supply: 100V~240V 50/60Hz worldwide range (US and Canada power plug) Dimension: 7-7/8 " x 10-1/4" x 16" (20cm x 26cm x 41cm) Net weight: 11 lb 11.5 oz (5.3 kg) Shipping package: 15 lb (7 kg) Packing List: Trinocular microscope with 4 DIN objectives Eyepieces: a pair of WF10X A bottle of Immersion oil Power cord (US and Canada standard) Mirror for power outage Dust cover Color filters Extra halogen bulb (6V/20W) Extra fuses