Specification: ? UCIS Infinity Independent Achromatic Optical System ? Seidentopf binocular/trincular viewing head, inclined 30° , 52-75mm interpupillary distance settings, ±5° Diopter adjustment ? WF10x plan eyepieces, 20mm field of view, high eye point up to 21mm ? Quintuple nosepiece inward facing with positive click stops ? Infinity long work distance plan Achromatic 10x, 20x, 40x and Infinity long work distance phase-contrast 20x objectives ? Mechanical stage, 180mmX155mm, move range 80mmX50mm ? N.A. 0.30 Abbe condenser with iris diaphragm, with phase-contrast slide, long work distance 72mm ? Coaxial coarse and fine focus mechanism with markings on fine focus knobs. Fine focus sensitivity 0.001mm ? 6 volt 30 watt halogen illumination ? Dust cover, power cord ? 110V-240V Wide voltage