National Optical 420AHF-20 Zoom Microscope - Certified 

The National Optical 420AHF-20 Stereo Zoom Microscope provides a continuous magnification range from 20x to 80x, combining a 1-4x zoom with paired 20x eyepieces. Its stereoscopic design enhances depth perception and user comfort, making it well-suited for laboratory and academic environments. The achromatic objective lens maintains parfocality and parcentered alignment throughout zooming, ensuring sharp, centered images. Illumination includes an independently adjustable 15W halogen top light and a 5W fluorescent bottom light. The viewing head accommodates specimens up to 45mm tall and rotates 360° for collaborative use. Additional features include dual-focus dials with slip clutch, adjustable interpupillary distance, diopter correction, and a reticle holder. The National 420-430PHF-10 model offers a continuous 10x to 40x zoom with upright, unreversed 3D images, dual halogen and fluorescent lighting, and a durable all-metal frame, ideal for precise inspection, dissection, and assembly in educational, industrial, and biomedical settings.

This microscope is commonly used for:

• Biological dissection and specimen analysis
• Industrial inspection of circuit boards, components, and materials
• Jewelry and gemstone evaluation
• Forensic and entomological studies
• Educational demonstrations in science labs

Its upright image and wide working distance make it especially useful for tasks requiring manipulation under magnification.

Key Benefits

• Provides a clear, three-dimensional view of specimens
• Continuous zoom allows seamless transition from overview to detail
• Dual illumination supports both opaque and translucent samples
• Ergonomic design reduces user fatigue during extended use
• Durable construction ensures long-term reliability in demanding environments

Features

• Widefield 10x eyepieces with dual diopter adjustment and 45° inclination
• Continuous zoom from 1x to 4x (10x to 40x total magnification)
• Achromatic, color-corrected optics for sharp, true-color imaging
• 360° rotating viewing head for flexible positioning
• Rack-and-pinion focusing with tension control and slip clutch
• Top 12V 15W halogen light with rheostat control
• Bottom 5W fluorescent light for cool, even illumination
• Base-mounted light switches for top, bottom, or dual lighting
• Two 80mm stage plates: frosted glass and reversible black/white contrast
• Heavy-duty post mount with locking collar for vertical adjustment
• All-metal frame with gray enamel finish
• Includes rubber eyeshields, dust cover, and instruction manual
• Lifetime limited warranty (excluding bulb, cord, and fuse)

Specialty / Medical Practice: Medical Laboratory, Materials Laboratory, Biological Laboratory, and more

Specifications:        

• Product Usage: Inspection of material in laboratory
• Brand: National Optical 
• Warranty: 15 days parts and labor only        
• Dimensions: 
• Voltage: 100-120 V 
• Days to be ready: 1-2 business days

 Related Collections:

• Centrifuges
• Laboratory Equipment
• Laboratory Microscopes

Frequently Asked Questions (FAQs)

1. What is the magnification range of the 420-430PHF-10?
   It offers a continuous zoom range from 10x to 40x using 10x eyepieces and a 1x–4x zoom objective.

2. Can I use this microscope for dissection?
   Yes, it’s ideal for dissection due to its upright, unreversed 3D image and ample working distance.

3. Does it support both top and bottom lighting?
   Yes, it features a halogen top light and a fluorescent bottom light, which can be used independently or together.

4. Is the viewing head adjustable?
   Yes, the head rotates 360° for flexible viewing angles.

5. What kind of eyepieces does it use?
   It comes with widefield 10x eyepieces and accepts 23mm reticles.

6. Can I upgrade the magnification?
   Yes, optional auxiliary lenses and eyepieces can expand the magnification range.

7. Is it suitable for viewing circuit boards?
   Absolutely. The zoom and lighting system make it excellent for inspecting electronic components.

8. What is the working distance?
   The standard working distance is approximately 80mm, depending on the auxiliary lens used.

9. How is focusing handled?
   It uses rack-and-pinion focusing with large dual knobs and a slip clutch to prevent damage.

10. Is the microscope portable?
    It weighs about 11.7 lbs (5.3 kg) and comes with a molded styrofoam case for safe transport.

11. What are the stage plate options?
    It includes a frosted glass plate and a reversible black/white contrast plate for different specimen types.

12. Can I use it with a camera?
    This model is binocular, but a trinocular version (420T-430PHF-10) is available for camera integration.

13. What power sources does it use?
    It operates on standard 110V or optional 220V with a CE-approved plug.

14. Is it suitable for classroom use?
    Yes, its durability and ease of use make it an excellent choice for educational settings.

15. What’s included in the box?
    The microscope, rubber eyeshields, stage plates, blue filter, dust cover, and instruction manual are included.