AO Spencer American Optical Microscope Phase Turret & Condenser Cat. 1240/1243

Description

American Optical phase contrast turret Cat. 1240 with intermediate working distance condenser cat. 1243.  Includes original 10x 20x 45x and 100x phase annuli and original phase wrenches.  Has auxiliary swing in condenser for low power objectives.  Iris diaphragm, turret centering screws, and annuli centering grub screws all function normally.  There are no cosmetic issues.  This unit fits series 10 and 20 microscopes.  Please ask any questions.
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