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The 460TBL-20 1-3x 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 460 stereo microscope has a paired 20x eyepiece delivering a 20x to 60x continuous magnification range. The achromatic objective lens system is parfocalled throughout the zoom range to keep the specimen in focus while zooming in/out.
The 460TBL-20 can illuminate the specimen from above using a 10W halogen light and/or from below the stage using a 5W fluorescent light; each light source is activated separately by base-mounted On/Off switches. To help optimize the brightness and contrast of the specimen, the top (incidental) light source has a reflector that is controlled by a directional lever next to the focus dial.
A user-friendly design complements the range of features that make the 460 stereo zoom microscope a welcome addition to labs and classrooms. The viewing head accommodates specimen heights up to 36mm / 1.4" 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 a single focus dial and includes a slip clutch mechanism to prevent mishandling. An adjustable interpupillary distance, individually adjustable diopter correction, and reticle holder/retainer provide the 460 series with the flexibility needed to create a customized viewing experience.
Paired 20x inclined eyepiece
1-3x achromatic and parfocalled objective system
20x to 60x magnification range
70mm / 2.8" working distance
36mm / 1.4" maximum specimen height
55-75mm / 2.2-3" interpupillary distance
Individual diopter adjustments
Accepts 23mm eyepiece reticle
Rack and pinion focus system
Slip clutch prevents over-turning
Tension adjustment prevents focus drift
Incidental (top) 10 watt halogen illumination with directional reflector
Transmitted (bottom) 5 watt fluorescent illumination with blue filter
Dual base-mounted On/Off switches
Grounded power cord
80mm translucent white stage plate, 80mm black contrast plate
Locked on metal stage clips
360° rotating viewing head
Cast metal frame
Grey enamel finish
12.5" (32 cm) height
9 lb (4 kg) weight
In the Box
National 460TBL-20 1-3x Stereo Zoom Microscope
Lifetime Limited Warranty (Excluding Bulb)
Table of Contents
1.0 - 3.0x
12 V, 10 W halogen (incidental), 110 V, 5 W fluorescent (transmitted)
80 mm transparent white stage plate, 80 mm black contrast plate
2.2 - 3" (55 - 75 mm)
Maximum Specimen Height
1.4" (36 mm)
12.5" (32 cm)
9 lb (4 kg)
National 460TBL-20 1-3x Stereo Zoom Microscope Review