The eyepiece is one of the elements of the optical system of the microscope that affects the magnification. The E20 20x eyepiece provides the best performance with 4x, 10x and 20x objectives. It can be installed in a tube with a diameter of 23.2 mm. The device does not have a diopter adjustment mechanism. If necessary, the adjustment can be made with the diopter adjustment ring (if available) on the eyepiece tube of the microscope.

Specifications
- Lens material: optical glass
- Degree of magnification, multiplier: 20
- Field of view diameter, mm: 11
- Diopter adjustment: −
- Eyepiece diameter, mm: 23.2
- Frame material: copper
- Eye distance, mm: 10

Compatibility
- MAGUS Bio 230B biological microscope
- MAGUS Bio 230BL biological microscope
- MAGUS Bio 230T biological microscope
- MAGUS Bio 230TL biological microscope
- MAGUS Pol 850 polarizing microscope