Introduction to the National Geographic Bresser Microscope 1200X

The National Geographic Bresser Microscope 1200X is an excellent entry-level microscope designed for young scientists eager to explore the microscopic world. With magnification capabilities ranging from 300x to 1200x, this microscope allows users to observe a variety of specimens in transmitted light. The kit includes essential accessories, such as prepared slides and tools for creating your own samples, making it perfect for educational purposes. The National Geographic Bresser Microscope is priced at approximately $39.90.

Specifications

Battery-powered illumination
Objectives: 7,5x,15x, 30x, eyepiece: 40x
Magnification: 300x-1200x
Extensive range of accessories
Age recommendation: 6 years +
Easy to understand manual
Delivery: microscope, hardcase, accessories, manual

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 (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 ﬁ re/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 ﬁ re. Excessive heat or improper handling could trigger a short-circuit, a ﬁ re 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.
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.

Parts overview

Eyepiece
Focus knob
Objective turret
Stage
Mirror
Electronic light source
Base with battery compartment
Rubber base
Microscope arm
Colour-ﬁlter disc
Prepared Slides
Cover Plates
Blank Slides
Petri dish
Micro projector
Replacement bulb
3X magnifying glass
Settling cylinder
Reservoir
Shrimp-farming accessories
Microscope instruments
Micro-slicer
Hatchery

Description

The National Geographic Bresser Microscope 1200X boasts a sturdy metal frame that ensures stability and durability. The binocular head allows for easy adjustment of the interpupillary distance and has a diopter adjustment for each eyepiece to accommodate different users' vision needs. The microscope's optical system is designed to provide high-contrast images with minimal distortion. The LED light source is energy-efficient and provides consistent illumination, which is crucial for observing delicate specimens.

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 eye-piece (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 placed on the stage (4). 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). Remove the microscope from the package and tilt the microscope arm (9) so that it’s in a comfortable viewing position for you.
Turn the focus knob (2) to the upper stop, and set the objective turret (3) to the lowest magnification.
Now, take a look through the eyepiece and adjust the mirror (5) so that you see a uniform, bright circle of light. Or, you can use the electronic light source (6).
You’ll find further tips about the light source in the next section.
Now, place a prepared slide (11) under the clips on the stage (4), directly under the objective. When you take a look through the eyepiece, you can see the magnified speci-men.
At this point, you still might see a slightly fuzzy picture. Adjust the image sharpness by slowly turning the focus knob (2) until the picture appears sharp and clear.
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 mag-nification. Also, the higher the magnification, the more light you will need for good illumination of the picture.

TIP: Avoid positioning the mirror so that it is exposed to direct sunlight, since it can cause a glare, which won’t allow you to get a clear picture.

Observation (electronic light source)

To use the electronic light source (6), you need to install two 1.5-volt batteries in the base of the mi-croscope (7).
Remove the rubber base (8) on the microscope and insert the batteries according to the displayed +/- information. Reattach the rubber base to the microscope.
You can turn on the light by rotating it in the direction of the stage (4). Take a look through the eye-piece and adjust the light so that you get optimal picture brightness.
Now you can observe in the same way as described in the previous section.
The bulbs for the electronic light can be replaced. One replacement bulb (16) is included.
When you use another bulb, make sure to pay attention to the maximum wattage, which is displayed on the lamp body.

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.

National Geographic Bresser Microscope 1200X Projector

The included micro-projector (15) is ideal for looking at a specimen with multiple people at the same time.
To use the projector, you also have to use the electronic light source (6). This way, you can show your results to your friends and family.
Unscrew the eyepiece (1) from the microscope and place the micro-projector on the open eyepiece support so that the matte screen is pointing behind you. Adjust the light so that the matte screen is lit up brightly.
You can adjust the focus of the prepared slide image using the focus knob (2).
Make sure to swivel the microscope arm (9) back into an upright position so that you can comfortably observe the speci-men.
In a dark room, it is also possible to project the microscope picture on a white wall.
To do this, remove the matte screen. Swivel the tripod so that the upper edge of the projector is horizontal.
Keep in mind that the image brightness is reduced and the picture will be darker if the projector is far away from the wall.

Setup Guide

To set up the National Geographic Bresser Microscope 1200X,

Start by placing the microscope on a stable surface.
Connect the power cord to the LED light source and turn it on. Adjust the brightness to your comfort level.
Assemble the microscope by attaching the objectives and eyepieces according to the user manual.
Use the coaxial coarse and fine focus knobs to adjust the focus.
Place your specimen on the mechanical stage and secure it using the stage clips.
Configure the condenser and iris diaphragm to optimize light transmission and reduce glare.

Notes on Cleaning

Before cleaning the device, disconnect it from the power supply by removing the plug or batteries.
Only use a dry cloth to clean the exterior of the device. To avoid damaging the electronics, do not use any cleaning ﬂ uid.
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.

Warranty and warranty term extension

The warranty term is two years from the date of purchase. Please keep your proof of purchase. Register at www.bresser.de/warranty and ﬁ ll out a brief questionnaire to get your warranty term extended to ﬁ ve years. Registration must be completed within three months of purchase (date of receipt) to validate the warranty. If you register thereafter, the warranty term will not be extended.

Troubleshooting

Common issues with the National Geographic Bresser Microscope 1200X include blurry images, insufficient lighting, and mechanical stage malfunctions.

To resolve blurry images, ensure that the objectives and eyepieces are properly aligned and clean.
Adjust the focus knobs carefully, and check if the specimen is properly secured on the stage.
If lighting is insufficient, adjust the LED light source brightness or check if the condenser is correctly positioned.
For mechanical stage issues, refer to the user manual for proper assembly and maintenance instructions.

Warning: Always handle the microscope with care, avoid touching the lenses, and keep it away from children and pets.

Pros & Cons

Pros

High-quality optical components providing clear images up to 1200X magnification.
Durable metal construction for long-term use.
Adjustable LED light source for optimal illumination.
Coaxial coarse and fine focus system for precise adjustments.
Carrying case for easy transport.

Cons

Higher price point compared to entry-level microscopes.
Requires some technical knowledge for setup and operation.
The mechanical stage can be tricky to assemble for beginners.
May require additional accessories such as slides and cover slips.

Customer Reviews

Customers have praised the National Geographic Bresser Microscope 1200X for its excellent optical quality and robust build. Many users have noted that it is a significant upgrade from lower-end microscopes, offering much clearer and more detailed observations.

Some common complaints include the initial complexity of setting up the microscope and the need for some practice to master its operation. However, overall satisfaction with the product's performance has been high.

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