Categories: BRESSER

BRESSER Microscope Mikroskop 40x-2000x Instruction Manual

BRESSER Microscope Mikroskop 40x-2000x Instruction Manual

Product Description


  • Choking hazard — This product contains small parts that could be swallowed by children. This poses a choking hazard.
  • Risk of electric shock — This device contains electronic components that operate via a power source (power supply and/or batteries). Only use the device as described in the manual, otherwise you run the risk of an electric shock.
  • Risk of fire/explosion — Do not expose the device to high temperatures. Use only the recommended batteries. Do not short-circuit the device or batteries, or throw them into a fire.
    Excessive heat or improper handling could trigger a short-circuit, a fire or an explosion.
  • Risk of chemical burn — Make sure you insert the batteries correctly. Empty or damaged batteries could cause burns if they come into contact with the skin. If necessary, wear adequate gloves for protection.
  • Do not disassemble the device. In the event of a defect, please contact your dealer. The dealer will contact the Service Centre and can send the device in to be repaired, if necessary.
  • Use only the recommended batteries. Always replace weak or empty batteries with a new, complete set of batteries at full capacity. Do not use batteries from different brands or with different capacities. Remove the batteries from the unit if it has not been used for a long time.
  • Never recharge normal, non-rechargeable batteries. This could lead to explosion during the charging process.
  • Tools with sharp edges are often used when working with this device. Because there is a risk of injury from such tools, store this device and all tools and accessories in a location that is out of the reach of children.
  • Keep instructions and packaging as they contain important information.


Dispose of the packaging materials properly, according to their type (paper, cardboard, etc). Contact your local waste disposal service or environmental authority for information on the proper disposal.

Do not dispose of electronic devices in the household garbage!
As per the Directive 2012/19/EC of the
European Parliament on waste electrical and electronic equipment and its adaptation into
German law, used electronic devices must be collected separately and recycled in an environmentally friendly manner.
Empty old batteries must be disposed of at battery collection points by the consumer. You can find out more information about the disposal of devices or batteries produced after 01.06.2006 from your local waste disposal service or environmental authority.

In accordance with the regulations concerning batteries and rechargeable batteries, disposing of them in the normal household waste is explicitly forbidden. Please pay attention to dispose of your used batteries as required by law – at a local collection point or in the retail market (a disposal in domestic waste violates the Battery Directive).

Batteries that contain toxins are marked with a sign and a chemical symbol. „Cd“ = cadmium, „Hg“ = mercury, „Pb“ = lead.

  1. battery contains cadmium
  2. battery contains mercury
  3. battery contains lead

EC Declaration of Conformity
Bresser GmbH has issued a “Declaration of Conformity” in accordance with applicable guidelines and corresponding standards. The full text of the EU declaration of conformity is available at the following internet address:

UKCA Declaration of Conformity
Bresser GmbH has issued a „Declaration of Conformity“ in accordance with applicable guidelines and corresponding standards. The full text of the UKCA declaration of conformity is available at the following internet address:

Bresser UK Ltd. • Suite 3G, Eden House, Enterprise Way, Edenbridge, Kent TN8 6HF, Great Britain

Here are the parts of your microscope

  1. 10x WF Eyepiece
  2. 25x WF Eyepiece
  3. 2x Barlow Lens
  4. Eyepiece supports
  5. Microscope Head with locking screw
  6. Objective Nosepiece
  7. Objective
  8. Clips
  9. Microscope Stage
  10. LED Illumination (transmitted light)
  11. Microscope Base
  12. Selection switch for Illumination
  13. Dimmer for Illumination
  14. Battery compartment
  15. Focus knob
  16. Colour Filter wheel
  17. LED Illumination (reflected light)
  18. Slides, Cover Slips and Prepared Specimens plastic box
  19. Specimens:
    1. Yeast
    2. Sea Salt
    3. Shrimp Eggs
    4. Empty Bottle
  20. Specimen slicer
  21. Hatchery
  22. Tweezers
  23. Dissecting needle
  24. Dissecting knife
  25. Pipette
  26. Container
  27. Smartphone holder

How do I use my microscope?

Before you assemble your microscope, make sure that the table, desk or whatever surface that you want to place it on is stable, and does not wobble.

How do I operate the electric LED illumination?

On the base of the microscope there is a battery compartment (14). Loosen the screw on the battery compartment cover with a small Philips screwdriver and remove the cover.

Place the batteries in the compartment so that the flat minus poles (-) press against the spring terminal and the plus poles (+) are touching the flat contact sheets.

Close the battery compartment with the cover and turn the microscope around again.

The first lamp shines onto the specimen from below and the second from above. (The thing that you want to observe with the microscope is called the object or specimen, by the way.)
You can use each lamp on its own, by using the selection switch (12). For example:

  1. the light only comes from below (transmitted light).
  2. the light only comes from above (reflected light).

For transparent objects (transmitted-light objects), number I is best. In order to observe firm, non-transparent objects (direct-light objects), select number II.

With the dimmer (13) you can adjust the brightness of the illumination.

When do I use the color filters?

The colour filter wheel (16) is located below the microscope stage (9). They help you when you are observing very bright or clear specimens.
Here, you can choose from various colours.
This helps you better recognise the components of colourless or transparent objects (e.g. grains of starch, protozoa).

How do I adjust my microscope correctly?

First, loosen the screw (5) and turn the microscope head into a comfortable viewing position. Each observation starts with the lowest magnification.

Adjust the microscope stage (9) so that it goes all the way down to the lowest position, using the focus knob (15).
Then, turn the objective nosepiece (6) until it clicks into place at the lowest magnification (objective 4x).

Before you change the objective setting, always move the microscope stage (9) to its lowest position. This way, you can avoid causing any damage!

Now, insert the 10x eyepiece (1) into the Barlow lens (3). Make sure that the Barlow lens is placed all the way into the eyepiece supports (4) and is not pulled out.

How do I observe the specimen?

After you have assembled the microscope with the adequate illumination and adjusted it correctly, the following basic rules are to be observed:
Start with a simple observation at the lowest magnification. This way, it is easier to position the object in the middle (centering) and make the image sharp (focusing).
The higher the magnification, the more light you will require for a good image quality.

Now place the prepared specimen (18) directly under the objective on the microscope stage.
The object should be located directly over the illumination (10).

In the next step, take a look through the eyepiece (1) and carefully turn the focus knob (15) until the image appears clear and sharp.
Now you can select a higher magnification by slowly removing the Barlow lens (3) from the eyepiece support (4). When the Barlow lens is almost completely pulled out, the magnification can be increased to almost double.

If you would like an even higher level of magnification, insert the 25x eyepiece (2) and turn the objective nosepiece (6) to a higher setting (10x or 40x).

Important tip:
The highest magnification is not always the best for every specimen!

Each time the magnification changes (eyepiece or objective change, pulling out the Barlow lens), the image sharpness must be readjusted with the focus knob (15). When doing this, make sure to be careful. If you move the microscope stage too quickly, the objective and the slide could come into contact and become damaged!

Which light for which specimen?

With this unit, a reflected light and transmitted light microscope, you can observe transparent, semi-transparent as well as non-transparent objects.
The image of the given object of observation is “transported” through the light. As a result, only the correct light will allow you to see something!

If you are observing non-transparent (opaque) objects (e.g. small animals, plant components, stones, coins, etc.) with this microscope, the light falls on the object that is being observed.
From there, the light is reflected back and passes through the objective and eyepiece (where it gets magnified) into the eye. This is reflected light microscopy.

For transparent objections (e.g. protozoa), on the other hand, the light shines from below, through the opening in the microscope stage and then through the object.
The light travels further through the objective and eyepiece, where it is also magnified, and finally goes into the eye. This is transmitted-light microscopy.
Many microorganisms in water, many plan components and the smallest animal parts are already transparent in nature. Others have to be prepared. We may make them transparent through a treatment or penetration with the right materials (media), or by taking the thinnest slices from them (by hand or a specimen slicer), and then examine them. You can read more about this in the following sections.

How do I make thin specimen slices?

Only do this with the supervision of your parents or another adult.

In order to get the best results, you will need some wax or paraffin. It is best if you use a candle. Place the wax in a pot and heat it carefully over a low heat. Now, dip the object in the liquid wax a few times. Then, let the wax get hard. Using the Specimen slicer (20) or a knife/scalpel, cut the smallest slices from the object that is covered with wax. These slices are to be laid on a slide and covered with a cover slip.

How do I make my own specimens?

Take the object that you want to observe and place it on a glass slide (18). Then, add a few drops of distilled water on the object using a pipette. Now, place a cover slip vertically at the edge of the drop of water, so that the water runs along the edge of the cover slip. Then, slowly lower the cover slip over the water drops.


Use the following web link to find interesting experiments you can try out.


Error Solution
No recognisable image
  • Turn on light
  • Readjust focus

Make sure your microscope has a long service life.

Clean the lens (objective and eyepiece) only with the cloth supplied or some other soft lintfree cloth (e.g.microfibre). Do not press hard as this might scratch the lens.

Ask your parents to help if your microscope is really very dirty. The cleaning cloth should be moistened with cleaning fluid and the lens wiped clean using little pressure.

Make sure your microscope is always protected against dust and dirt. After use leave it in a warm room to dry off. Then install the dust caps and keep it in the case provided.

Smartphone holder

Open the flexible holder and put your smartphone in it. Close the cradle and make sure your phone is properly seated. The camera must be positioned exactly above the eyepiece. Open the locking clip on the back of the holder and fit the eyepiece view exactly onto your smartphone camera. Now retighten the locking clip and attach the smartphone holder to the eyepiece of your microscope. Now start the camera app. If the image is not yet centered on your display, loosen the locking clip slightly and readjust. It may be necessary to use the zoom function to fill the image on the display.
A slight shading at the edges is possible. Remove the smartphone from the cradle after use!

Make sure that the smartphone cannot slip off the cradle. Bresser GmbH accepts no liability for damage caused by a dropped smartphone!


The regular warranty period is 2 years and begins on the day of purchase. To benefit from an extended voluntary guarantee period as stated on the gift box, registration on our website is required.

You can consult the full warranty terms as well as information on extending the warranty period and details of our services at

Made under licence
TM & © Oxford Limited

Manual_9203820000000_Microscope_gb-de-fr-nl-it-es-pt_OXFORD_v082022a Errors and technical changes reserved.

Bresser GmbH
Gutenbergstr. 2
46414 Rhede

Bresser UK Ltd.
Suite 3G, Eden House
Enterprise Way, Edenbridge,
Kent TN8 6HF, Great Britai






WARNINGS! Not suitable for children under three years. CHOKING HAZARD – small parts. PUNCTURING HAZARD – functional sharp points! LACERATING HAZARD – functional sharp edges! Keep instructions and packaging as they contain important information.

Documents / Resources

BRESSER Microscope Mikroskop 40x-2000x [pdf] Instruction Manual
9203820 GYE 000, 9203820 WXH 000, Microscope Mikroskop, 40x-2000x, Microscope Mikroskop 40x-2000x, Microscope



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