The 420-1105-15 1-4x Stereo Zoom Microscope from National Optical is a stereoscopic zoom microscope designed for laboratories and university students. The stereo (two) eyepiece configuration is preferred by most researchers and students because of the superior depth of field and comfort compared to monocular microscopes. This model of the 420 stereo microscope has a paired 15x eyepiece delivering a 15x to 60x continuous magnification range. The achromatic 1-4x objective lens system is parfocalled and parcentered throughout the zoom range to keep the specimen in focus and centered while zooming in/out. Optional eyepieces and auxiliary objectives expand the magnification range and working distances of the optical system.

A user-friendly design complements the range of features that make the 420 stereo zoom microscope a welcome addition to labs and classrooms. The 420-1105 has a universal stand with counterbalanced boom arm that enables a range of viewing positions, and is ideal for specimens that are too large or abnormally-shaped for fixed arm microscopes. The viewing head accommodates specimen heights up to 437mm / 17.2" and is capable of 360° rotation to help share the stereo eyepiece among colleagues and students without moving the microscope. The rack and pinion system has dual focus dials and includes a slip clutch mechanism to prevent mishandling. An adjustable interpupillary distance, individually adjustable diopter correction, and height-adjustable viewing head provide the 420 series with the flexibility needed to create a customized viewing experience.