How to select a biological microscope for bacteria observing?


There are many biological microscope can be used for bacteria observing. But the price is quite different. 

How to select a right one?  You must know the requirement and the budget.

1. Who will use it? This will decide how good the microscope you need.
2. Budget. If there are no limit, suggest a better one.

1) Research institution for research, such as professional bacteria research lab. 

2) Research lab of company who produce  bactericide.

3) Teaching insiituation such as school or equal.

4) Students.