Stereoscopy gives dissecting convenience. Dissecting the specimen becomes easier because viewing the specimen at same time while dissecting it can be done. Larger specimens like rock minerals can also be conveniently viewed because there is more distance between the objective and the stage.
These are the evolved, refined, and fine-tuned progeny of the simple microscope, read a tube with one end containing a plate for the specimen and a lens at the opposite end to view the object in its magnified state at 10 x more its original diameter.
With these general characteristics of an excellent research microscope, you should be able to choose the best value for your money. Someday soon, humanity will thank you for your new discoveries.
There are many types of technologies for biological microscopes, too. You can choose compound microscopes for observing very small specimens like pond samples, cells and other microscopic forms of life. These are usually the most common type found in schools and homes.
If you are the sort of businessperson eager to produce quality products you have a use for an industrial microscope. But you are not a scientist you say. Well, quite true, but this microscope will help you spot defects or product imperfections before these are distributed to stores for retail.