This provides a simple and positive method for ensuring that the metal surface is exactly perpendicular to optical axis of the microscope. The pressure on the plunger knob renders the upper polished surface parallel to the under surface of the microscope slide on which it is mounted with a plastic material such as plasticize. General Description and Specifications: The Leveller is provided with a steel shaft having bronze bushing, retracting spring and a structural steel frame finished in hammer tone grey paint.