BRESSER 8851300000000 Microscope


Operating Instructions

WARNING! Not for children under three years. Choking hazard – small parts. Contains functional sharp edges and points!

ATTENTION: Only suitable for children of at least 8 years of age. Instructions for parents or other responsible persons are enclosed and must be followed. Keep packaging as it contains important information.

General Warnings 

  • 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 (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.
  • Leaking battery acid can lead to chemical burns. Avoid contact of battery acid with skin, eyes and mucous membranes. In the event of contact, rinse the affected region immediately with a plenty of water and seek medical attention.
  • 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 itis not to be used for a long period of time, or if the batteries are empty!
  • Never recharge normal, non-rechargeable batteries. This could lead to explosion during the charging process.
  • Rechargeable batteries are only to be charged under adult supervision.
  • Rechargeable batteries are to be removed from the toy before being charged
  • The terminals must not be short-circuited.
  • 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.
  • 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.
  • The chemicals and liquids provided should be kept out of reach of children. Do not drink the chemicals! Hands should be washed thoroughly under running water after use. In case of accidental contact with the eyes or mouth rinse with water. Seek medical treatment for ailments arising from contact with the chemical substances and take the chemicals with you to the doctor.
  • Warning: The specimen slicer contains functional sharp edges and points!

TIPS on cleaning 
Remove the device from it’s energy source before cleaning (remove batteries). Only use a dry cloth to clean the exterior of the device. To avoid damaging the electronics, do not use any cleaning fluid.
Protect the device from dust and moisture. The batteries should be removed from the unit if it has not been used for a long time.

Dispose of the packaging material/s as legally required. Consult the local authority on the matter if necessary. Do not dispose of electrical equipment in your ordinary refuse. The European guideline 2002/96/EU on Electronic and Electrical Equipment Waste and relevant laws applying to it require such used equipment to be separately collected and recycled in an environment-friendly manner.
Empty batteries and accumulators must be disposed of separately. Information on disposing of all such equipment made after 01 June 2006 can be obtained from your local authority.
In accordance with the regulations concerning batteries and rechargeable batteries, disposing of them in normal household waste is explicitly forbidden. Please pay attention to disposal of your used batteries as required by law – at a local collection point or in the retail market (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.

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:

Parts overview


  1. Zoom Eyepiece
  2. Focus knob
  3. Objective turret
  4. Stage
  5. On/off switch ( illumination)
  6. Electronic light source
  7. Base with battery compartment
  8. Battery compartment (3x AA)
  9. Cover plates
  10. Prepared slides
  11. Reservoir
  12. Microscope instruments
  13. Wheel with pinhole apertures
  14. Measuring cup
  15. Hatchery
  16. MicroCut
  17. Smartphone holder

What is a microscope? 
A microscope contains two lens systems: the eyepiece and the objective. We’re presenting these systems as one lens each so that the concept is easier to understand. In reality, however, the eyepiece (1) and the objective in the turret (3) are made up of multiple lenses. The lower lens (objective) produces a magnified image of the prepared specimen. The picture, which you can’t see, is magnified once more by the second lens (eyepiece, 1), which you can see as the ‘microscope picture’.

Assembly and location 
Before you start, choose an ideal location for using your microscope. It’s important that you choose a spot with enough light for normal observation. Furthermore, it is recommended that you place the microscope on a stable surface because a shaky surface will not lead to satisfactory results.

Normal observation


For normal observation, place the microscope in a bright location (near a window or desk lamp, for example). Turn the focus knob (2) to the upper stop, and set the objective turret (3) to the lowest magnification. Now, turn on the light using the switch on the microscope base. You’ll find further tips about the light source in the next section. Now, place a prepared slide under the clips on the stage (4), directly under the objective (1). When you take a look through the eyepiece, you can see the magni-fied specimen. At this point, you still might see a slightly fuzzy picture. Adjust the image sharpness by slowly turning the focus knob (2). You can now select a higher magnification by turning the objective turret and selecting a different objective. When you do so, note that the sharpness of the picture must be adjusted again for the higher magnification. Also, the higher the magnification, the more light you will need for good illumination of the picture. The wheel with pinhole apertures (13) below the microscope stage (4) will help you in viewing very bright or clear-sighted preparations. Turn the wheel (13) till the best contrast is achieved.

Observation (electronic light source) 


For observation with the electronic light source (6) you need to insert 3 AA batteries 1.5 V, in the battery compartment (8) on the base of the microscope (7). The battery compartment is opened using a Phillips screwdriver. Insert the batteries with the correct polarity (+/- indication). Put the battery cover first into the small opening so that the lid fits perfectly. Now you can tighten the screw.
The lighting is switched on when you turn the switch on the microscope base. Now you can observe in the same way as described in the previous section. TIP: The higher the magnification you use the more light is required for a good illumination of the picture. Therefore, always start your experiments with a low magnification.

Condition and prepare viewed objects

This microscope features transmitted light, so that transparent species can be examined. If opaque specimens are being examined, the light from below goes through the specimen, lens and eyepiece to the eye and is magnified en route (direct light principle). Some small water organisms, plant parts, and animal components are transparent by nature, but many others require pretreatment — that is, you need to make the thinnest possible slice of the object by hand cutting or using a microtome, and then examine this sample.

Creation of thin preparation cuts
Specimens should be sliced as thin as possible. A little wax or paraffin is needed to achieve the best results. Put the wax into a heat-safe bowl and heat it over a flame until the wax is melted. You can use a candle flame to melt the wax.

Be extremely careful when dealing with hot wax, as there is a danger of being burned.

Then, dip the specimen several times in the liquid wax. Allow the wax that encases the specimen to harden. Use a MicroCut or other small knife or scalpel to make very thin slices of the object in its wax casing.

Be extremely careful when using the MicroCut, knife or scalpel. These instruments are very sharp and pose a risk of injury.

Place the slices on a glass slide and cover them with another slide before attempting to view them with the microscope.

Creation of your own preparation
Put the object to be observed on a glass slide and cover the object with a drop of distilled water using the pipette (12). Set a cover glass (available at a well-stocked hobby shop) perpendicular to the edge of the water drop, so that the water runs along the edge of the cover glass. Now lower now the cover glass slowly over the water drop.

Use the following web link to find interesting experiments you can try out. Microscope accessories can be found here: Now that you’re familiar with your microscope’s functions and how to prepare slides, you can complete the following experiments and observe the results under your microscope.

How do You Raise Brine Shrimp?
Accessories (from your microscope set):

  1. Shrimp eggs
  2. Sea salt,
  3. Hatchery,
  4. Yeast.

The Life Cycle of Brine Shrimp
Brine shrimp, or “Artemia salina,” as they are called by scientists, have an unusual and interesting life cycle. The eggs produced by the female are hatched without ever being fertilized by a male shrimp. The shrimp that hatch from these eggs are all females. In unusual circumstances, e.g. when the marsh dries up, the male shrimp can hatch. These males fertilize the eggs of the females and from this mating, special eggs come about. These eggs, so-called “winter eggs,” have a thick shell, which protects them. The winter eggs are very resistant and capable of survival if the marsh or lake dries out, killing off the entire shrimp population. They can persist for 5-10 years in a “sleep” status. The eggs hatch when the proper environmental conditions are reproduced. These are the type of eggs you have in your microscope set.

The Incubation of the Brine Shrimp
In order to incubate the shrimp, you first need to create a salt solution that corresponds to the living conditions of the shrimp. For this, put a half liter of rain or tap water in a container. Let the water sit for approx. 30 hours. Since the water evaporates over time, it is advisable to fill a second container with water and let it sit for 36 hours. After the water has sat stagnant for this period of time, add half of the included sea salt to the container and stir it until all of the salt is dissolved. Now, put a few eggs in the container and cover it with a dish. Place the glass container in a bright location, but don’t put it in direct sunlight. Since you have a hatchery, you cal also add the salt solution along with a few eggs to each of the four compartments of the tank. The temperature should be around 25º. At this temperature, the shrimps will hatch in about 2-3 days. If the water in the glass evaporates, add some water from the second container.

The Brine Shrimp under the Microscope
The animal that hatches from the egg is known by the name “nauplius larva.” With the help of a pipette, you can place a few of these larvae on a glass slide and observe them.
The larvae will move around in the saltwater by using their hair-like appendages. Take a few larvae from the container each day and observe them under the microscope. In case you’ve hatched the larvae in a hatchery, simply take off the cover of the tank and place the tank on the stage. Depending on the room temperature, the larvae will be mature in 6-10 weeks. Soon, you will have had raised a whole generation of brine shrimp, which will constantly grow in numbers.

Feeding your Brine Shrimp
In order to keep the brine shrimp alive, they must be fed from time to time, of course. This must be done carefully since overfeeding can make the water become foul and poison our shrimp population. The feeding is done with dry yeast in powdered form. A little bit of this yeast every second day is enough. If the water in the compartments of the hatchery or your container turns dark, that is a sign that it is gone bad. Take the shrimp out of the water right away and place them in a fresh salt solution.

The shrimp eggs and the shrimp are not meant to be eaten!


Smartphone holder
Open the flexible holder and put your smartphone in it. Close the cra-dle 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!

Warranty & Service

The regular guarantee period is 5 years and begins on the day of purchase. You can consult the full guarantee terms and details of our services at

Documents / Resources

BRESSER 8851300000000 Microscope [pdf] Instruction Manual
8851300000000 Microscope, 8851300000000, Microscope

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