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The 411TBL-20 2x/4x Stereo Microscope from National Optical is a dual magnification stereoscopic microscope fit for laboratories, high school 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 411 microscope has a paired 20x eyepiece delivering 40x and 80x magnification. The stage can be illuminated from above using a 10W tungsten light and/or from under stage using a 15W tungsten light, both activated by separate base-mounted On/Off switches.
A user-friendly design complements the range of features that make the 411 series a welcome addition to labs as well as classrooms. This microscope has a single focusing dial and a 360° rotating viewing head to help share the eyepiece among colleagues and students without moving the microscope. The rack and pinion focus system also includes a slip clutch mechanism to prevent mishandling. An adjustable interpupillary distance, left-side diopter correction, and reticle holder provide the 411 series stereo microscope with the flexibility needed to create a customized viewing experience.
Paired 20x inclined eyepiece
2x and 4x achromatic objectives
40x and 80x magnification
Parfocalled, parcentered, paired objectives
95mm / 3.7" working distance, 27mm / 1.1" maximum specimen height
Eyepiece with diopter adjustment and reticle holder/retainer
55-75mm / 2.2-3" interpupillary distance
Rack and pinion focus system
Slip clutch prevents over-turning
Tension adjustment prevents focus drift
Incidental (top) 10 watt tungsten illumination
Transmitted (bottom) 15 watt tungsten illumination with blue filter
Dual base-mounted On/Off switches
80mm frosted glass and 80mm reversible black and white stage plates
Locked on metal stage clips
360° rotating viewing head
Cast metal frame
Grey enamel finish
14.6" (37 cm) maximum height
9 lb (4.1 kg) weight
In the Box
National 411TBL-20 2x/4x Stereo Microscope
Lifetime Limited Warranty (Excluding Bulb)
Table of Contents
2.0x / 4.0x
12 V, 10 W tungsten (incidental); 110 V, 15 W tungsten (transmitted) with blue filter
80 mm frosted glass and reversible black/white contrast plate