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We use these microscopes in biology and have constantly been told how expensive they are. Upon doing some research, I found that they cost several hundred pounds to several thousand depending on what model you buy. This particular variety one costs several hundred.
The microscope contains several different magnifications- 1/10, 1/40, 1/100, 1/1000 times, and should be adjusted depending on what slides you are looking at for clarity. There are knobs to adjust the clarity and the movement of the slide, which is clipped in place by the slide plate. The microscope is lit from the underside, powered by a mains battery supply and has a easy to carry handle that can allow it to be transported.
So what can they be used for? In biology we use these to look at biological slides such as cross sections of arteries, kidneys and can also be used with a haemocytometer. The distance between the microscopic lens and the slide plate is quite deep, although this is adjusted for magnification and which particular lens you use.
These light microscopes are fine for looking at large cells and organelles, but smaller ones such as ribosomes cannot be seen which will require an electron microscope. For everything that we have looked at so far, these microscopes are sufficient and give enough clarity to draw from. The lens also has a scale marked out on it so you can judge the size of the subject you are looking at with ease.
Overall, these microscopes are very powerful for a school lab, and if you are a scientist, you really should own one. Bresser do some of the best microscopes so you should look into getting one from them. They aren't cheap, but they are definitely a strong and durable piece of kit that scientists really should invest in!