
A comparison microscope is a device used to analyze side-by-side specimens. It consists of two microscopes connected by an optical bridge, which results in a split view window enabling two separate objects to be viewed simultaneously. This avoids the observer having to rely on memory when comparing two objects under a conventional microscope. ==Hi...
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http://en.wikipedia.org/wiki/Comparison_microscope

a microscope having two objective lenses and using a system of prisms to form in one eyepiece adjacent images of two different objects.
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https://www.infoplease.com/dictionary/comparison-microscope
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