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Student Compound Microscopes:
Observer Series by LW Scientific
Popular student compound microscopes for children and schools; offering rugged design, modular construction and superb optics.  You'll be delighted by the quality and performance of these instruments, as well as by our low prices!
Multiple Model Configurations for every model:  Choose among monocular, binocular, and teaching models with tungsten, fluorescent, halogen, and even cordless LED illumination.  Popular options include mechanical stages and carry case.
 
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More pictures are available on each
model's web page and here.

Observer Student Compound Microscopes by LW Scientific
Binocular Models Teaching Head Mechanical Stage
The models...
Observer II  [Base model]
40x, 100x, 400x
Disc diaphragm, Simple condenser
starts at $189   go there
Observer III  [Intermediate model]
40x, 100x, 400x, spot for extra objective
Iris diaphragm, Abbe condenser
starts at $246   go there
Observer IV  [Advanced model]
Same as Observer III, but adds 100x objective (1000x power)
starts at $282   go there
Side-by-Side Comparisons Below

Side-by-Side Comparison of the OBSERVER Models:

Diagram of Basic Microscope Parts [ click here ]

Shared features:  (Glossary:  click on the words in blue)
  • Patented Modular Design by LW Scientific
  • Manufacturer Under ISO 9002 Certification ...A Higher Standard of Quality!
  • Monocular, Binocular, and Teaching Head Available
  • 40x, 100x, 400x (Observer II-D & III) - Observer IV Adds 1000x!
  • Quality Multi-Coated Glass Objectives - DIN Achromatic
  • Metal Alloy Construction with Acid and Reagent Resistant Finish
  • 10x Wide Field 18mm Glass Eyepiece(s) with Eye Pointer
  • Fine and Coarse Focus with Metal Rack and Pinion Gearing
  • Anti-Slip Clutch to Keep the Focus from Drifting
  • Head Rotates 360 Degrees
  • Objectives are Color Coded and Parfocal and Parcentric
  • Mirror Illuminator Included for "Field Readiness"
  • 122mm x 122mm Stage, Pre-Drilled for Mechanical Stage
  • Adjustable Stage Stop to Keep Slides and Objectives from Colliding
  • Limited Lifetime Manufacturer's Warranty
  • Dust Cover, Manual, and Warranty Card Included

Differences between the models:

Model:

 Observer IV Observer III Observer II-D
Prices start at: $282 $246 $189
Nosepiece 4 place 4 place 3 place
Magnifications 40x, 100x, 400x, 1000x (oil) 40x, 100x, 400x
*Spot for fourth objective		 40x, 100x, 400x
Coaxial Focus

Available

 Available -
Built-In Mechanical Stage Available Available Add-On Available
Halogen Illum. Available Available Available
Fluorescent Illum. Available Available Available
Tungsten Illum. - - Available
Cordless Models Available Available Available
Condenser Focusable Abbe Focusable Abbe Fixed Simple
Diaphragm Metal Iris Metal Iris 5-Hole Disk
Filter Holder with Filters Yes
blue, green		 Yes
blue, green		 -

Go there:

 Observer IV Observer III Observer II-D
Accessories for the Observer microscopes:  carry case, bulbs, camera adapters, slides and kits...
Glossary / Definitions
  • Abbe - An Abbe condenser is composed of two lenses and performs better than the simple, single lens condenser.
  • Achromatic - Refers to a two-element lens which offers better performance than a single element lens.
  • Coaxial Focus - Fine and coarse focus mechanisms and control knobs are located together, requiring only the movement of the fingers to reach each.
  • Condenser - Gathers light from the microscope light source and concentrates it into a cone of light that illuminates the specimen with uniform intensity over the entire viewfield.
  • Diaphragm - Helps regulate light entering the condenser.  The iris condenser uses overlapping plates that allow for almost infinite adjustments.  A disk diaphragm has sized holes drilled in the disk.
  • DIN - It stands for "Deutsche Industrie Norm".  It's an international standard of measurement.  The Observer objectives conform to this standard.
  • Mechanical Stage - A device which allows slides to be precisely manipulated with control knobs.  It is invaluable when viewing at higher magnifications.  (picture)
  • Nosepiece - Holds the objectives
  • Parfocal - The specimen remains in focus when switching between objectives.
  • Parcentric - The specimen remains in the center of the view when switching between objectives.

For those interested, here's an incredibly detailed source of information about microscopes and microscopy:  Molecular Expressions Microscopy Primer: Introduction to Microscopy

[ Student Compound Microscopes ]

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