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There are several different basic types of Microscopes.
1. A scanning electron Microscope, worth Millions. Find these at universities and Sydney Technical College had one. But they cost millions
2. Biological Microscopes effective Magnification limit is 1500 times. From $500 up for good quality one. I would buy used. Mine worth $1200 was stolen,
3, Stereo Microscopes, may be up to around 100 magnification. Some are zoom, mine is not. Mine an Olympus gives 20X and 40X magnification.
4. Metallurgical Microscope -- have no experience with one of these.
So it depends also what you want to do with the microscope.
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