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National 411TBL-20 2x 4x Stereo Microscope

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User Manual for National 411TBL-20 2x 4x Stereo Microscope

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National 411TBL-20 2x 4x Stereo Microscope Contents of the user manual for the National 411TBL-20 2x 4x Stereo Microscope
  • Product category: Microscopes National
  • Brand: National
  • Description and content of package
  • Technical information and basic settings
  • Frequently asked questions – FAQ
  • Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
  • Authorized service for National Microscopes

User manual for the National 411TBL-20 2x 4x Stereo Microscope contain basic instructions that need to be followed during installation and operation. Before starting your appliance, the user manual should be read through carefully. Follow all the safety instructions and warnings, and be guided by the given recommendations. User manual is an integral part of any National product, and if it is sold or transferred, they should be handed over jointly with the product. Following the instructions for use is an essential prerequisite for protecting health and property during use, as well as recognition of liability on the part of the manufacturer for possible defects should you make a warranty claim. Download an official National user manual in which you will find instructions on how to install, use, maintain and service your product.

And do not forget – unsuitable use of a National product will considerably shorten its lifespan!



Product description

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
In the Box National 411TBL-20 2x/4x Stereo Microscope
  • Eyeshields
  • Dustcover
  • Limited Lifetime Warranty (Excluding Bulb)
  • Table of Contents




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    Technical parameters

    National 411TBL-20 Specs

    Microscope Type Stereo
    Eyepiece 20.0x
    Objective(s) 2.0x / 4.0x
    Head Inclined
    Light Source 12 V, 10 W tungsten (incidental); 110 V, 15 W tungsten (transmitted) with blue filter
    Light Control 4-position On/Off
    Stage 80 mm frosted glass and reversible black/white contrast plate
    Interpupillary Adjustment 2.2 - 3" (55 - 75 mm)
    Maximum Specimen Height 1.1" (27 mm)
    Maximum Height 14.6" (37 cm)
    Weight 9 lb (4.1 kg)

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