National 131 Series Student Compound Microscopes

National 131 Series Student Compound Microscopes. Our most popular series for middle and high school instruction is enhanced with LED illumination. Delivers higher light efficiency than standard 20 watt tungsten bulb, and cool operating temperature prolongs specimen life when viewing live material. Same precision optical and mechanical features as our best selling 130 series. Combines extra rugged construction with user-friendly features. OPTICAL SYSTEM Widefield 10x eyepiece with revolving pointer. Accepts optional #965-160 eyepiece reticle. 45° inclined viewing head rotates 360° for easy repositioning of eyepiece and sharing by more than one student, or for reverse position viewing. DIN standard, achromatic, parfocalled, parcentered, and color-corded: 4x (0.10 N.A.), 10x (0.25 N.A.), and 40xR (0.65 N.A.) objectives. 4-hole nosepiece is ball-bearing mounted for more precise alignment, has positive click stops. ILLUMINATION Built-in LED, delivers greater light and longer life tha