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National Optical Model 120-L for instruction through grade 12.
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National Optical Model 120-L for instruction through grade 12.
Extra rugged, large frame with full sized DIN optical system. Less expensive vertical tube design affords full-sized, high school features and specifications in a very affordable price range. Solid, full-feature performance for instruction through grade 12.
OPTICAL SYSTEM
Widefield 10x eyepiece with revolving pointer.
45mm DIN objectives are achromatic, parfocalled, parcentered, color coded: 4x (0.10N.A.), 10x (0.25N.A.), 40xR (0.65N.A.).
Revolving triple nosepiece with positive click stops.
ILLUMINATION
Model 120-L with factory mounted 115v 15 watt substage illuminator with in-line on/off switch.
FOCUSING
Rack and pinion coarse focus, plus graduated fine focus.
Slip clutch prevents damage to focus mechanism.
Tension adjustment eliminates focusing drift.
Safety rack stop prevents damage to slides and objective lenses.
STAGE
Large 125mm x 115mm (5 in. x 4-1/2 in.) stage, with locked-on stage clips, is predrilled and tapped to accept optional mechanical stage.
In-stage 0.65NA condenser lens.
Calibrated 5-hole disc diaphragm.
FRAME
Rugged cast metal, gray enamel finish.
Height 350mm (14 in.).
WARRANTY
Lifetime limited warranty, excluding bulb, cord, and fuse.
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 "Click to enlarge image(s)")