National Optical 131 Student Compound Microscope with Tungsten Illumination

Product Description

Imported from USA

The National Optical 131 Basic Monocular Compound Microscope has a 10x widefield eyepiece with pointer, a forward-facing
nosepiece with three DIN achromatic objectives that are parcentered and parfocal, tungsten illumination, separate coarse
and fine focus, a disc diaphragm, and a plain stage with stage clips. The monocular viewing head has a fixed inclination
to reduce eye and neck strain, and 360-degree rotation capability to enable sharing. An eyepiece pointer is used to
identify features for students. A forward-facing nosepiece eases changing objectives. Rotation positions with secure,
positive stops ensure accurate positioning and support a range of magnification options. Achromatic objectives provide
color correction of magnified images. Parcentered and parfocal objectives ensure that the image stays centered and
focused when the magnification is changed. The 40xR objective is retractable and spring-loaded to prevent damage to the
slide or objective when focusing. A basic compound microscope is used in classroom, home school, and hobbyist settings
for inspection and dissection of specimens when two-dimensional images are desired.

The microscope has lower (diascopic) Brightfield illumination that transmits light up through the specimen for enhanced
visibility of translucent and transparent objects. Brightfield (BF) illumination allows the specimen to absorb light,
resulting in a dark image on a light background. The tungsten (incandescent) light source provides bright light. A disc
diaphragm controls the amount of light illuminating the specimen. The plain stage has an opening for light transmission,
stage clips to secure the slide or specimen in place while viewing, and pre-drilled holes that accept a mechanical stage
(sold separately). Separate coarse and fine focus knobs speed focusing. A slip clutch prevents excess pressure from
damaging the slides or objectives, a stage stop prevents the stage or specimen from coming into contact with the
objectives, and a focus tension control prevents stage drift. The cast metal frame provides durability and has a gray
enamel finish.

Microscope Head and Optics Specifications


Magnification range

Head inclination
45 degrees

Eyepiece (18mm)


Objectives, DIN achromatic, parcentered, parfocal
4x, 10x, 40xR (retractable)

Microscope Illumination and Stage Specifications

Focus type
Separate coarse and fine

0.65 NA

Light source
Tungsten, 20W

Disc, five-hole

Illumination type

Stage type

Stage dimensions
110 x 120mm (W x D)


W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Microscopes are instruments used to enhance the resolution of an object or image. Types include compound, stereo, or
digital. Compound microscopes use a compound optical system with an objective lens and an eyepiece. Stereo microscopes
show object depth in a three-dimensional image. Digital microscopes are used to display an image on a monitor, rather
than looking through a lens. Microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces,
with varying magnification abilities. Magnification ability refers to the size of an image. Resolution, also known as
resolvant power, refers to the clarity of the image. The interaction between field of view (FOV), numerical aperture
(NA), and working distance (WD) determines resolution. Microscopes can control magnification through a fixed focus, or
through a range of adjustments. They can also utilize LED, fluorescent, and mirror light sources to help control viewing
capabilities. Microscopes are widely used in education, lab research, biology, metallurgy, engineering, chemistry,
manufacturing, and in the medical, forensic science, and veterinary industries.

National Optical and Scientific Instruments manufactures microscopes and microscope cameras. The company, founded in
1991, is headquartered in Schertz, TX.

What's in the Box?

* National Optical 131 Basic Monocular Compound Microscope
* WF10x eyepiece, 18mm
* 4x DIN achromatic objective
* 10x DIN achromatic objective
* 40xR (retractable) DIN achromatic objective
* Dust cover
* Instructions

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