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The National Optical and Scientific Instruments Model 157 Compound Microscope is designed for the classroom, with a number of teach-preferred elements. First and foremost would be the 157's magnification which is 40x, 100x, 400x, and 1000x. Allowing students (and teachers alike!) to experience these magnification are the four DIN standard, achromatic, parfocalled, parcentered, and color-coded objectives in 4x, 10x, 40xR, and 100xR. Of course, also essential to the microscope's operation would be the 10x widefield eyepieces.
The Model 157 is illuminated by a built-in 5W fluorescent light. This light virtually gives off no base heat and is rated with a life of 10,000 hours. An on/off switch on the base allows for easy control, while the grounded 3-wire electrical system ensures safety and reliability.
When it comes to focusing, the microscope is both durable and easy for students to use. The slip clutch prevents damage, while the tension adjustment eliminates stage drift. The stage can be moved up or down, and the eyepiece and body remain fixed in place. A safety rack prevents damage to slides and the objective lens.
Widefield 10x eyepieces with pointer. Accepts optional #965-160 eyepiece reticle
45° inclined binocular viewing head rotates 360° for easy sharing by more than one student
DIN standard 4x (0.10 N.A.), 10x (0.25 N.A.), 40xR (0.65 N.A.) and 100xR (1,25 N.A.) objectives are supplied for 40x, 100x, 400x and 1000x magnification. All are achromatic, parfocalled, parcentered and color-coded
4-hole objective turret, reverse position, ball-bearing mounted for smooth, precise changes in magnification
Built-in 5-watt fluorescent illumination, delivers greater light and longer life than standard 20-watt tungsten bulb. Virtually no base heat. 10,000 hour rated bulb
Base mounted on/off switch, heavy-duty 3-wire grounded electrical system and plug
0.5A time delay fuse
Separate low position coarse and fine focusing controls
Stage moves up or down, eyepiece and body remain fixed
Slip clutch prevents damage to focusing system
Tension adjustment eliminates stage drift
Safety rack stop prevents damage to slides and objective lenses
Large 135mm x 135mm (5-1/4 x 5-1/4") stage, with professional quality, low profile mechanical specimen holder with low-position coaxial x-y controls
1.25 N.A. Abbe condenser with spiral focusing mount, iris diaphragm, swing-out filter holder, blue filter supplied
Rugged cast metal, gray enamel finish
Height 380mm (15"); Net wt. 4.6 kgs (11 lbs)
Lifetime limited warranty, excluding bulb, cord, and fuse