OMAX 40X-2500X Lab Binocular Biological Compound LED Microscope with 3D Mechanical Stage and Coaxial Coarse/Fine Focusing Knob Total magnification: 40X-100X-250X-400X-1000X-2500X; Eyepieces: widefield WF10X and WF25X; Objectives: achromatic DIN 4X, 10X, 40X(S), 100X(S, Oil); Viewing head: 45 degrees inclined 360 degrees swiveling binocular Sliding adjustable interpupillary distance: 2-3/16inch ~ 2-15/16inch(55~75mm); Ocular diopter adjustable on both eyetubes; Nosepiece: revolving quadruple; Stage: mechanical double layer size: 4-1/2inchx 4-15/16inch (115mm x 125mm) Stage x-y stroke (travel range): 2-13/16inch x 1-3/16inch (70mm x 30mm); Condenser and diaphragm: NA1.25 Abbe condenser with iris diaphragm; Transmitted (lower) illuminator: LED light, intensity adjustable Focus adjustment: Coaxial coarse and fine knobs on both sides; All metal mechanical components; Power supply: AC/DC adapter, 7.5V/7.5W (UL approved) - Input: 100-240VAC, 50/60Hz, 0.5A Max - Output: DC7.5V, 1000mA 5-year warranty against manufacturing defects