MED 25B - Microscope Levenhuk - Free user manual and instructions
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| Product Type | Biological Microscope |
| Model | MED 25B |
| Brand | Levenhuk |
| Magnification Range | 40x - 1000x |
| Eyepiece | WF10x/20 mm |
| Objective Lenses | 4x, 10x, 40x, 100x (oil) |
| Illumination | LED with adjustable brightness |
| Power Supply | 100-240 V AC, 50/60 Hz |
| Dimensions (L x W x H) | 280 x 180 x 390 mm |
| Weight | 5.2 kg |
| Stage | Mechanical double-layer stage, 140 x 140 mm |
| Condenser | Abbe condenser, N.A. 1.25 with iris diaphragm |
| Focus System | Coaxial coarse and fine focus |
| Head | Binocular, 30° inclined, 360° rotatable |
| Filter Holder | Yes, for 45 mm filters |
| Warranty | Lifetime |
| Maintenance | Clean lenses with soft cloth; use lens paper; store in dust cover |
| Safety | Always unplug before cleaning; avoid direct sunlight |
| Spare Parts | Available via Levenhuk service centers |
Frequently Asked Questions - MED 25B Levenhuk
How do I change the magnification on the Levenhuk MED 25B?
Rotate the nosepiece to select the desired objective lens (4x, 10x, 40x, or 100x). Use the coarse and fine focus knobs to bring the image into sharp focus.
What is the best magnification for viewing bacteria?
For bacteria, use the 100x oil immersion objective with a drop of immersion oil on the slide. This provides a magnification of 1000x when combined with the 10x eyepiece.
How do I clean the lenses of my microscope?
Use a lens cleaning brush to remove dust, then gently wipe with lens paper dampened with a small amount of isopropyl alcohol. Avoid using regular cloth or paper.
Why is the image dark or unevenly illuminated?
Check the brightness adjustment knob. Ensure the condenser is centered and the iris diaphragm is open appropriately. Clean the condenser lens if needed.
Can I use the microscope for both brightfield and darkfield observations?
The Levenhuk MED 25B is primarily a brightfield microscope. For darkfield, you may need an optional darkfield condenser or a patch stop.
What type of slides can I use?
Standard 75 x 25 mm glass slides with coverslips. For oil immersion, use a coverslip thickness of 0.17 mm.
How do I adjust the interpupillary distance?
Hold the binocular tubes and gently pivot them until you see a single circular field. Note the scale for future use.
The focus knob is stiff. What should I do?
Clean the focus rack and pinion with a soft cloth. If still stiff, apply a tiny amount of light machine oil to the rack. Do not over-lubricate.
How do I replace the LED bulb?
Unplug the microscope. Locate the LED module at the base. Remove the retaining screw and pull out the module. Replace with a compatible LED (available from Levenhuk).
What does the warranty cover?
Levenhuk offers a lifetime warranty on the MED 25B against manufacturing defects. It does not cover misuse or damage from improper cleaning.
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USER MANUAL MED 25B Levenhuk
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Product information
Brand : Levenhuk
Model : MED 25B
Category : Microscope