OMAX 40X-2000X Binocular Dry Darkfield Compound Biological Microscope with Replaceable LED Light Total magnification: 40X-80X-100X-200X-400X-800X-1000X-2000X; Eyepieces: widefield WF10X/18 and WF20X; Objectives: achromatic DIN 4X, 10X, 40X (S), 100X (S, Oil); Viewing head: 45 degrees inclined 360 degrees swiveling binocular; Interpupillary distance: sliding adjustable 2-3/16inch ~ 2-15/16inch (55mm ~ 75mm) Diopter: adjustable on both eyepiece tubes; Nosepiece: revolving quadruple; Stage: mechanical stain-resistant double layer, size: 5-1/2inch x 5-1/2inch (140mm x 140mm), translation range: 3inch x 2inch (75mm x 50mm); Focus: coaxial coarse and fine focus knobs on both sides, rack and pinion adjustment, with tension control Focusing knob can be locked for observation and transportation; Brightfield condenser: NA1.25 Abbe condenser with iris diaphragm and filter holder, rack and pinion adjustment; Dry darkfield condenser: NA0.7-0.9; Black palm rest on the base Illumination: transmitted (lower), replaceable 3W LED light, variable intensity; Metal mechanical components; Power supply: 100V~240V 50/60Hz worldwide range (US and Canada power plug) 5-year warranty against manufacturing defects