National Optical 131-RLED Basic Monocular Compound Microscope, WF10x Eyepiece, 40x-400x Magnification, Brightfield, LED Illumination, Disc Diaphragm, Plain Stage, Battery-Powered

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The National Optical 131-RLED Basic Monocular Compound Microscope, WF10x Eyepiece, 40x-400x Magnification, Brightfield, LED Illumination, Disc Diaphragm, Plain Stage, Battery-Powered.

The National Optical 131-RLED 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, LED 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 LED light source provides bright, cool light for working with temperature-sensitive or live specimens, and operates on rechargeable batteries for cordless operation. 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, and a tension adjustment on the coarse control ensures specimen stays focused during viewing. 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
Head Monocular
Magnification range 40x-400x
Head inclination 45 degrees
Eyepiece (18mm) WF10x
Nosepiece Forward-facing
Objectives, DIN achromatic, parcentered, parfocal 4x, 10x, 40xR (retractable)

Microscope Illumination and Stage Specifications
Focus type Separate coarse and fine
Condenser 0.65 NA
Light source LED
Diaphragm Disc
Illumination type Brightfield
Stage type Plain
Stage dimensions 110 x 120mm (W x D)
Power (3) rechargeable AA nickel metal hydride (NiMH) batteries

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-RLED Basic Monocular Compound Microscope
  • WF10x eyepiece, 18mm
  • 4x DIN achromatic objective
  • 10x DIN achromatic objective
  • 40xR (retractable) DIN achromatic objective
  • (3) rechargeable NiMH AA batteries
  • Battery charger
  • Hex key wrench
  • Dust cover
  • Instructions

Product Features

  • Compound microscope provides high magnification for biological use and educational applications
  • Monocular viewing head with 18mm 10x widefield eyepiece with pointer, fixed 45-degree vertical inclination to reduce eye and neck strain, and 360-degree rotation capability to provide a more comprehensive view and enable sharing
  • Forward-facing nosepiece with 4x, 10x, and 40xR DIN achromatic, parfocal, parcentered objectives that provide color correction of magnified images and keep the image centered and focused when magnification is changed
  • Brightfield, LED illumination and built-in 0.65 NA condenser with disc diaphragm for clear examination and light control
  • Plain stage with clips secures slide in place, and separate coarse and fine focus knobs speed focusing

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