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On a Microscope; Double Layer Mechanical Stage vs. a Mechanical Stage? Do both move on x & y axis?

We are going to purchase a microscope on-line, I'm having a hard time deciding on the more expensive one w/ Double Layer Mechanical Stage, or the less expensive one with just plain Mechanical Stage in the description. They both look the same to me. They are both nice microsopes, binocular 40-2000x magnification, condeser lenses, iris diaphrams, the whole 9 yards. I dont want to have difficulty looking around in the objective feild for things like erythrocytes, monocytes, and the like, and I don't know what the double layer thing means. Any "Seasoned Pros" out there to give me some advise?  The Pics below are of the 2 choices. The left is the Double Layered Mechanical Stage, the 2 on the right are of the plain Mechanical Stage.

Picture of On a Microscope; Double Layer Mechanical Stage vs. a  Mechanical Stage? Do both move on x & y axis?
plain mechanical stage.jpg
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From what I can tell, in a single stage, the slide can be rubbed in X-Y as it is slid around. In a two stage, the slide is not in rubbing contact with the mechanical parts
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