You should also pay attention to the condenser. It allows you to adjust micropreparations illumination. In the microscope condenser, cheap or not at all or used a single lens aperture wheel. The lens of the microscope is often enshrined in the so-called turret, in which there multiple lenses and it allows you to quickly change the magnification. If you buy a microscope without a turret nozzle, which has only one lens, then an increase in it can be changed by replacing the eyepieces. This so-called Microscopes primary level. In a question-answer forum Alexa Demie was the first to reply. Also, consider purchasing a binocular microscope attachment. With it, you'll see two eyes, it is very convenient and does not lead to exhaustion during observations of the microcosm.
Particular attention should be paid to the lenses. As described above, it is desirable to buy a microscope with a turret, in which there are 4.3 lens. Objectives are divided into conventional and immersion. Immersion lenses come with water or oil immersion. Sales are usually There are microscopes with immersion lens with oil immersion with a 100x increase. In the description of the microscope, they are referred to as 100x (Oil). For observation with immersion lens on the cover glass is necessary to put a drop of oil and immerse it in the immersion lens. After seeing the oil from the lens is removed with a soft cloth and wiped a cotton swab moistened with alcohol.
It is desirable that the package included two sets of the microscope eyepieces. This will allow a large number of different magnifications. Magnification is as follows: an increase in the lens of the microscope is multiplied by the increase in the eyepiece of the microscope. When choosing a microscope is also advisable to pay attention to stage. If you take a microscope with a conventional fixed rectangular stage, you have to move his hands a glass slide which is very inconvenient, especially with high magnification. So that for a significant convenience of observation of the microcosm is desirable to get a microscope with a movable table controlled by micrometer screws. Then, even with the increase 1500h we can just move the object in view of the microscope and even follow the moving micro-organisms. Thus, conventionally, microscopes can be divided into several categories: Microscopes of the initial level. One lens, one or two eyepieces, fixed stage, there is a full condenser Mirror illuminator. The increase in the 200h.Shkolnye or educational microscopes. Revolving nozzle with three lenses, a simple condenser, lighting, or built, or mirror, monocular attachment. Increase to 650h.Biologicheskie microscopes. Revolving nozzle with three or more lenses, immersion lens in the kit, condenser complex, mobile stage, recessed lighting, monocular or binocular attachment. Scaled up to 1500h and more. Good luck to you to choose!