The Microscope Tube Adapter (BD-MTA) is designed for use with a compound microscope. All compound microscopes have oculars that are set to an international standard of 23mm. Lower Power 'Dissection' scopes however are not set to an international standard. The ocular diameter can range anywhere from 28 to 32mm. As a result, we cannot provide a solution for all models of dissection scopes. Contact the vendor / maker of the microscope to see if they carry a step-down adapter that will allow you to use the Microscope Tube Adapter on your dissection scope.