National 411TBL-20 2x/4x Stereo Microscope

BH #NASI411TBL20 • MFR #411TBL-20
National
National 411TBL-20 2x/4x Stereo Microscope
Key Features
  • 10W Top/12W Bottom Tungsten Lighting
  • 45° Inclined Viewing Head
  • 20x Stereo Eyepiece
  • 2x/4x Objectives, 40x/80x Magnification
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.
Special Order
Expected availability: 7-14 business days
$364.95

National 411TBL-20 2x/4x Stereo Microscope

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National 411TBL-20 Overview

  • 1Description
  • 2Optical System
  • 3Focusing
  • 4Lighting
  • 5Construction Details

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.

Optical System

  • 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

Focusing

  • Rack and pinion focus system
  • Slip clutch prevents over-turning
  • Tension adjustment prevents focus drift

Lighting

  • Incidental (top) 10 watt tungsten illumination
  • Transmitted (bottom) 15 watt tungsten illumination with blue filter
  • Dual base-mounted On/Off switches

Construction Details

  • 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

National 411TBL-20 Specs

Microscope TypeStereo
Head45° Inclined Binocular
Nosepiece1-Position Nosepiece
Imaging
Optical Magnification40x, 80x
Objective2x, 4x
Eyepiece20x
Illumination
Illumination TypeTop: Tungsten (12 V, 10 W)
Bottom: Tungsten (15 W)
General
Interpupillary Adjustment55 to 75 mm / 2.2 to 3"
Dimensions3.2" / 8 cm (Specimen Stage)
14.6" / 37 cm (Microscope)
Weight9 lb / 4.1 kg
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