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Pictures of Micro Motion Sensing System (M2S2) (a) without the hand-support cover, and (b) with the hand-support cover, showing (1) the location of the workspace (within the yellow dash line), (2) the reflective ball, (3) non-reflective instrument shaft, (4) the aspheric lens, (5) bi-convex lenses, (6) the PSD modules placed inside light absorption cloths, and (7) the hand-support cover.
