This category includes microscopes that are basically upgrades to the microscopes in the previous price categories, and microscopes that are in a completely different realm, where specialized applications require different architectures (like inverted microscopes) or the limits of resolution are being pushed (laser confocal scanning microscopes, electron microscopes, etc.).
These microscopes might combine bright field, dark field, phase contrast, and epi-fluorescence capability in one device, without the need to upgrade with kits. They will generally have Kohler illumination, and PLAN objectives, or PLAN apochromatic objectives.
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Celestron Professional PLAN $1100 http://www.microscopes.com/ms-ci-mi-44110.html
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400x Inverted $1260 http://www.lowestpricemicroscopes.com/40-to-400x-inverted-cellular-tissue-culture-trinocular-microscope/
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LABOROSCOPE AL-3000 Trinocular $1900 http://www.microscopes.com/ms-la-mi-al-3000.html
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LOMO INVERTOSCOPE $3898 http://www.microscopes.com/ms-la-mi-invertoscope.html
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LOMO Polam-L $7450 http://www.microscopes.com/ms-la-mi-polam.html