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High School Microscopes 131 Series

From $344.95
List Price From $387.00

These National Optical High School Microscopes 131 have a rugged metal construction with locked-on parts that stands up to the rigors of the science classroom. The widefield 10x eyepieces with built-in revolving pointer and DIN standard 4/10/40x achromatic parfocalled, parcentered and color-coded objectives provide excellent viewing for most standard classroom applications. 

Frames are constructed of rugged cast aluminum with a chemically-resistant enamel finish. The triple aperture objective turret (all except EF3292Q, which has a 4-hole turret) is equipped with ball-bearings for precise alignment and positive click stops for simple and sure magnification alterations. Focusing is accomplished through a fine and coarse low position adjustment system. Fine focus is equipped with a graduated scale for determining the depth of field. A slip-clutch protects the focusing mechanism from damage due to over-turning and a tension adjustment eliminates focus drift. Rack stop feature prevents damage to slides and lenses. 

Extra-large and heavy bases and bodies help keep microscopes stable during use and also help to avoid accidents. Headpiece, eyepiece, and stage clips are all locked in for extra added security. The microscope head is inclined 45° and rotates 360° for increased viewing comfort. Choose either a 110 x 120 mm stage with locked-on, spring-mounted stage clips or a graduated mechanical stage that makes specimen location quick and easy.

All models except EF3292Q have a built-in 0.65 substage condensers with blue filter, equipped with a calibrated 5-aperture disc diaphragm. 

Oil immersion model EF3292Q has a 1.25 N.A. Abbe condensers with iris diaphragm and swing-out filter holder.

Key Features

  • DIN optical system and precision mechanical components ensure sharp viewing
  • Models include the 6 most commonly-used configurations
  • Lifetime limited warranty (excludes bulb, cord, and accessory mechanical stage)
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Cat # Configuration Illumination Mechanical Stage Additional Features Units Of Measure Availability Price Quantity
EF3292M131
Monocular Tungsten -
  • 100x Immersion Lens: -
Ships By: 1/8/2018
  • $344.95
  • List: $387.00
EF3292N131MS
Monocular Tungsten Yes
  • 100x Immersion Lens: -
Ships By: 1/8/2018
  • $435.95
  • List: $490.00
EF3292Q131SPMS
Monocular Tungsten Yes
  • 100x Immersion Lens: Yes
Ships By: 1/8/2018
  • $624.95
  • List: $701.00
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