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Broad Range Zoom Microscope Head Binocular and Trinocular Models User Guide...
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Loosen the head retention screw, place the head into the ring mount, and secure with the head retention screw. Eyepieces Remove the protective cover on the Optical Head objective housing. ABR-Z32 or ABR-Z33 Prepare eyepieces Diopter Adjustment Remove the eyetube covers and insert Zoom Control Knob eyepieces into the eyetubes.